1naresh2naresh<pre>Array
(
    [urn:ac.highwire.org:guest:identity] => Array
        (
            [runtime-id] => urn:ac.highwire.org:guest:identity
            [type] => guest
            [service-id] => ajnr-ac.highwire.org
            [access-type] => Controlled
            [privilege] => Array
                (
                    [urn:ac.highwire.org:guest:privilege] => Array
                        (
                            [runtime-id] => urn:ac.highwire.org:guest:privilege
                            [type] => privilege-set
                            [privilege-set] => GUEST
                        )

                )

            [credentials] => Array
                (
                    [method] => guest
                )

        )

    [a82b2803-e3fe-4e76-939e-e9b1117e6830] => Array
        (
            [runtime-id] => a82b2803-e3fe-4e76-939e-e9b1117e6830
            [type] => toll-free-key
            [service-id] => ajnr-ac.highwire.org
            [access-type] => Controlled
            [privilege] => Array
                (
                    [7b97e537-2e4a-4ffc-9d4f-30d6a4e19722] => Array
                        (
                            [runtime-id] => 7b97e537-2e4a-4ffc-9d4f-30d6a4e19722
                            [type] => toll-free-key
                        )

                )

            [credentials] => Array
                (
                    [method] => toll-free-key
                    [value] => tf_ipsecsha;eccb35e721dadd193a85711ba0636f90a6258dcc
                )

        )

)
1naresh2naresh<pre>Array
(
    [urn:ac.highwire.org:guest:identity] => Array
        (
            [runtime-id] => urn:ac.highwire.org:guest:identity
            [type] => guest
            [service-id] => ajnr-ac.highwire.org
            [access-type] => FreeToRead
            [privilege] => Array
                (
                    [urn:ac.highwire.org:guest:privilege] => Array
                        (
                            [runtime-id] => urn:ac.highwire.org:guest:privilege
                            [type] => privilege-set
                            [privilege-set] => GUEST
                        )

                )

            [credentials] => Array
                (
                    [method] => guest
                )

        )

    [df82515e-8572-41e9-ad46-9cb1af6d470b] => Array
        (
            [runtime-id] => df82515e-8572-41e9-ad46-9cb1af6d470b
            [type] => toll-free-key
            [service-id] => ajnr-ac.highwire.org
            [access-type] => FreeToRead
            [privilege] => Array
                (
                    [7efe64ff-802c-46ca-8cd7-fbb380036ffa] => Array
                        (
                            [runtime-id] => 7efe64ff-802c-46ca-8cd7-fbb380036ffa
                            [type] => toll-free-key
                        )

                )

            [credentials] => Array
                (
                    [method] => toll-free-key
                    [value] => tf_ipsecsha;eccb35e721dadd193a85711ba0636f90a6258dcc
                )

        )

)
1naresh2naresh<pre>Array
(
    [urn:ac.highwire.org:guest:identity] => Array
        (
            [runtime-id] => urn:ac.highwire.org:guest:identity
            [type] => guest
            [service-id] => ajnr-ac.highwire.org
            [access-type] => FreeToRead
            [privilege] => Array
                (
                    [urn:ac.highwire.org:guest:privilege] => Array
                        (
                            [runtime-id] => urn:ac.highwire.org:guest:privilege
                            [type] => privilege-set
                            [privilege-set] => GUEST
                        )

                )

            [credentials] => Array
                (
                    [method] => guest
                )

        )

    [05ed0470-5b99-43f2-9cd2-0e126dc2e812] => Array
        (
            [runtime-id] => 05ed0470-5b99-43f2-9cd2-0e126dc2e812
            [type] => toll-free-key
            [service-id] => ajnr-ac.highwire.org
            [access-type] => FreeToRead
            [privilege] => Array
                (
                    [2d8f37b4-d7aa-4984-9a7f-3cc7e70e5376] => Array
                        (
                            [runtime-id] => 2d8f37b4-d7aa-4984-9a7f-3cc7e70e5376
                            [type] => toll-free-key
                        )

                )

            [credentials] => Array
                (
                    [method] => toll-free-key
                    [value] => tf_ipsecsha;eccb35e721dadd193a85711ba0636f90a6258dcc
                )

        )

)
1naresh2naresh<pre>Array
(
    [urn:ac.highwire.org:guest:identity] => Array
        (
            [runtime-id] => urn:ac.highwire.org:guest:identity
            [type] => guest
            [service-id] => ajnr-ac.highwire.org
            [access-type] => FreeToRead
            [privilege] => Array
                (
                    [urn:ac.highwire.org:guest:privilege] => Array
                        (
                            [runtime-id] => urn:ac.highwire.org:guest:privilege
                            [type] => privilege-set
                            [privilege-set] => GUEST
                        )

                )

            [credentials] => Array
                (
                    [method] => guest
                )

        )

    [822bd111-48b2-4eec-9ac0-fb32313e4879] => Array
        (
            [runtime-id] => 822bd111-48b2-4eec-9ac0-fb32313e4879
            [type] => toll-free-key
            [service-id] => ajnr-ac.highwire.org
            [access-type] => FreeToRead
            [privilege] => Array
                (
                    [e4f1c2c7-8123-4e9c-b3ad-f876def08ac2] => Array
                        (
                            [runtime-id] => e4f1c2c7-8123-4e9c-b3ad-f876def08ac2
                            [type] => toll-free-key
                        )

                )

            [credentials] => Array
                (
                    [method] => toll-free-key
                    [value] => tf_ipsecsha;eccb35e721dadd193a85711ba0636f90a6258dcc
                )

        )

)
1naresh2naresh<pre>Array
(
    [urn:ac.highwire.org:guest:identity] => Array
        (
            [runtime-id] => urn:ac.highwire.org:guest:identity
            [type] => guest
            [service-id] => ajnr-ac.highwire.org
            [access-type] => Controlled
            [privilege] => Array
                (
                    [urn:ac.highwire.org:guest:privilege] => Array
                        (
                            [runtime-id] => urn:ac.highwire.org:guest:privilege
                            [type] => privilege-set
                            [privilege-set] => GUEST
                        )

                )

            [credentials] => Array
                (
                    [method] => guest
                )

        )

    [a82b2803-e3fe-4e76-939e-e9b1117e6830] => Array
        (
            [runtime-id] => a82b2803-e3fe-4e76-939e-e9b1117e6830
            [type] => toll-free-key
            [service-id] => ajnr-ac.highwire.org
            [access-type] => Controlled
            [privilege] => Array
                (
                    [7b97e537-2e4a-4ffc-9d4f-30d6a4e19722] => Array
                        (
                            [runtime-id] => 7b97e537-2e4a-4ffc-9d4f-30d6a4e19722
                            [type] => toll-free-key
                        )

                )

            [credentials] => Array
                (
                    [method] => toll-free-key
                    [value] => tf_ipsecsha;eccb35e721dadd193a85711ba0636f90a6258dcc
                )

        )

)
1naresh2naresh<pre>Array
(
    [urn:ac.highwire.org:guest:identity] => Array
        (
            [runtime-id] => urn:ac.highwire.org:guest:identity
            [type] => guest
            [service-id] => ajnr-ac.highwire.org
            [access-type] => Controlled
            [privilege] => Array
                (
                    [urn:ac.highwire.org:guest:privilege] => Array
                        (
                            [runtime-id] => urn:ac.highwire.org:guest:privilege
                            [type] => privilege-set
                            [privilege-set] => GUEST
                        )

                )

            [credentials] => Array
                (
                    [method] => guest
                )

        )

    [a82b2803-e3fe-4e76-939e-e9b1117e6830] => Array
        (
            [runtime-id] => a82b2803-e3fe-4e76-939e-e9b1117e6830
            [type] => toll-free-key
            [service-id] => ajnr-ac.highwire.org
            [access-type] => Controlled
            [privilege] => Array
                (
                    [7b97e537-2e4a-4ffc-9d4f-30d6a4e19722] => Array
                        (
                            [runtime-id] => 7b97e537-2e4a-4ffc-9d4f-30d6a4e19722
                            [type] => toll-free-key
                        )

                )

            [credentials] => Array
                (
                    [method] => toll-free-key
                    [value] => tf_ipsecsha;eccb35e721dadd193a85711ba0636f90a6258dcc
                )

        )

)
1naresh2naresh<pre>Array
(
    [urn:ac.highwire.org:guest:identity] => Array
        (
            [runtime-id] => urn:ac.highwire.org:guest:identity
            [type] => guest
            [service-id] => ajnr-ac.highwire.org
            [access-type] => Controlled
            [privilege] => Array
                (
                    [urn:ac.highwire.org:guest:privilege] => Array
                        (
                            [runtime-id] => urn:ac.highwire.org:guest:privilege
                            [type] => privilege-set
                            [privilege-set] => GUEST
                        )

                )

            [credentials] => Array
                (
                    [method] => guest
                )

        )

    [a82b2803-e3fe-4e76-939e-e9b1117e6830] => Array
        (
            [runtime-id] => a82b2803-e3fe-4e76-939e-e9b1117e6830
            [type] => toll-free-key
            [service-id] => ajnr-ac.highwire.org
            [access-type] => Controlled
            [privilege] => Array
                (
                    [7b97e537-2e4a-4ffc-9d4f-30d6a4e19722] => Array
                        (
                            [runtime-id] => 7b97e537-2e4a-4ffc-9d4f-30d6a4e19722
                            [type] => toll-free-key
                        )

                )

            [credentials] => Array
                (
                    [method] => toll-free-key
                    [value] => tf_ipsecsha;eccb35e721dadd193a85711ba0636f90a6258dcc
                )

        )

)
1naresh2naresh<pre>Array
(
    [urn:ac.highwire.org:guest:identity] => Array
        (
            [runtime-id] => urn:ac.highwire.org:guest:identity
            [type] => guest
            [service-id] => ajnr-ac.highwire.org
            [access-type] => Controlled
            [privilege] => Array
                (
                    [urn:ac.highwire.org:guest:privilege] => Array
                        (
                            [runtime-id] => urn:ac.highwire.org:guest:privilege
                            [type] => privilege-set
                            [privilege-set] => GUEST
                        )

                )

            [credentials] => Array
                (
                    [method] => guest
                )

        )

    [a82b2803-e3fe-4e76-939e-e9b1117e6830] => Array
        (
            [runtime-id] => a82b2803-e3fe-4e76-939e-e9b1117e6830
            [type] => toll-free-key
            [service-id] => ajnr-ac.highwire.org
            [access-type] => Controlled
            [privilege] => Array
                (
                    [7b97e537-2e4a-4ffc-9d4f-30d6a4e19722] => Array
                        (
                            [runtime-id] => 7b97e537-2e4a-4ffc-9d4f-30d6a4e19722
                            [type] => toll-free-key
                        )

                )

            [credentials] => Array
                (
                    [method] => toll-free-key
                    [value] => tf_ipsecsha;eccb35e721dadd193a85711ba0636f90a6258dcc
                )

        )

)
1naresh2naresh<pre>Array
(
    [urn:ac.highwire.org:guest:identity] => Array
        (
            [runtime-id] => urn:ac.highwire.org:guest:identity
            [type] => guest
            [service-id] => ajnr-ac.highwire.org
            [access-type] => FreeToRead
            [privilege] => Array
                (
                    [urn:ac.highwire.org:guest:privilege] => Array
                        (
                            [runtime-id] => urn:ac.highwire.org:guest:privilege
                            [type] => privilege-set
                            [privilege-set] => GUEST
                        )

                )

            [credentials] => Array
                (
                    [method] => guest
                )

        )

    [b6e4c64e-c58b-476f-86ed-12dc0bbd5533] => Array
        (
            [runtime-id] => b6e4c64e-c58b-476f-86ed-12dc0bbd5533
            [type] => toll-free-key
            [service-id] => ajnr-ac.highwire.org
            [access-type] => FreeToRead
            [privilege] => Array
                (
                    [7c975d6d-1017-4e55-adeb-79e687f63e4d] => Array
                        (
                            [runtime-id] => 7c975d6d-1017-4e55-adeb-79e687f63e4d
                            [type] => toll-free-key
                        )

                )

            [credentials] => Array
                (
                    [method] => toll-free-key
                    [value] => tf_ipsecsha;eccb35e721dadd193a85711ba0636f90a6258dcc
                )

        )

)
<!DOCTYPE html>
<html lang="en" dir="ltr" 
  xmlns="http://www.w3.org/1999/xhtml"
  xmlns:mml="http://www.w3.org/1998/Math/MathML">
  <head prefix="og: http://ogp.me/ns# article: http://ogp.me/ns/article# book: http://ogp.me/ns/book#" >
    <!--[if IE]><![endif]-->
<link rel="dns-prefetch" href="//securepubads.g.doubleclick.net" />
<link rel="dns-prefetch" href="//scholar.google.com" />
<link rel="dns-prefetch" href="//cdn.jsdelivr.net" />
<link rel="dns-prefetch" href="//www.google.com" />
<link rel="dns-prefetch" href="//www.googletagmanager.com" />
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<link rel="shortlink" href="/node/11219" />
<meta name="Generator" content="Drupal 7 (http://drupal.org)" />
<link rel="shortcut icon" href="http://ajnr-stage2.stage.highwire.org/sites/default/files/images/favicon.ico" type="image/vnd.microsoft.icon" />
<meta name="type" content="article" />
<meta name="category" content="research-article" />
<meta name="HW.identifier" content="/ajnr/20/3/461.atom" />
<meta name="HW.pisa" content="ajnr;20/3/461" />
<meta name="DC.Format" content="text/html" />
<meta name="DC.Language" content="en" />
<meta name="DC.Title" content="Benign Expansile Lesions of the Sphenoid Sinus: Differentiation from Normal Asymmetry of the Lateral Recesses" />
<meta name="DC.Date" content="1999-03-01" />
<meta name="DC.Publisher" content="American Journal of Neuroradiology" />
<meta name="DC.Rights" content="Copyright © American Society of Neuroradiology" />
<meta name="DC.AccessRights" content="restricted" />
<meta name="DC.Description" content="BACKGROUND AND PURPOSE : There is a wide range of normal variation in sphenoid sinus development, especially in the size of the lateral recesses. The purpose of this study was to determine imaging characteristics that may help differentiate between opacification of a developmentally asymmetric lateral recess and a true expansile lesion of the sphenoid sinus.

METHODS: Coronal CT was performed in seven patients with expansile or erosive benign lesions of the sphenoid sinus, and results were compared to a control population of 72 subjects with unopacified sphenoid sinuses. The degree of asymmetry of lateral recess development was assessed with particular attention to the separation of vidian's canal and the foramen rotundum (vidian-rotundum distance). The images were also examined for evidence of: erosion, defined as loss of the normal thin bony margin on at least two contiguous sections; apparent thinning of the sinus wall, defined as a focal apparent decrease in thickness again on at least two contiguous sections; and for vidian's canal or foramen rotundum rim erosion or flattening.

RESULTS: Of the seven patients with expansile lesions, vidian's canal margin erosion was present in seven, unequivocal sinus expansion in three, wall erosion in three, wall thinning in three, erosion of the foramen rotundum in two, and flattening in the foramen rotundum in four. Forty-one of the 72 controls had lateral recess formation, 28 of which were asymmetric. The distance between vidian's canal and the foramen rotundum (vidian-rotundum distance) relied on the presence or absence of pneumatization, with a significantly larger distance in the presence of greater wing pneumatization. Examination of 24 controls revealed apparent thinning of the sinus wall, typically at the carotid groove, but no flattening, thinning, or erosion of the vidian canal or of the foramen rotundum.

CONCLUSION: Examination of controls and patients with expansile or erosive lesions of the sphenoid sinus revealed side-to-side asymmetry in the development of the sinus and lateral recess, making subtle expansion difficult to assess. Furthermore, variability in the vidian-rotundum distance correlated with degree of pneumatization, and did not necessarily reflect expansion. Thus, in the absence of gross sinus wall erosion, flattening or erosion of the rims of vidian's canal or the foramen rotundum provides the most specific evidence of an expansile or erosive process within the sinus." />
<meta name="DC.Contributor" content="Jonathan S. Lewin" />
<meta name="DC.Contributor" content="Hugh D. Curtin" />
<meta name="DC.Contributor" content="Elizabeth Eelkema" />
<meta name="DC.Contributor" content="Nancy Obuchowski" />
<meta name="article:published_time" content="1999-03-01" />
<meta name="article:section" content="HEAD AND NECK" />
<meta name="citation_title" content="Benign Expansile Lesions of the Sphenoid Sinus: Differentiation from Normal Asymmetry of the Lateral Recesses" />
<meta name="citation_abstract" lang="en" content="&lt;p&gt;&lt;i&gt;BACKGROUND AND PURPOSE&lt;/i&gt;: There is a wide range of normal variation in sphenoid sinus development, especially in the size of the lateral recesses. The purpose of this study was to determine imaging characteristics that may help differentiate between opacification of a developmentally asymmetric lateral recess and a true expansile lesion of the sphenoid sinus.&lt;/p&gt;&lt;p&gt;&lt;i&gt;METHODS:&lt;/i&gt; Coronal CT was performed in seven patients with expansile or erosive benign lesions of the sphenoid sinus, and results were compared to a control population of 72 subjects with unopacified sphenoid sinuses. The degree of asymmetry of lateral recess development was assessed with particular attention to the separation of vidian9s canal and the foramen rotundum (vidian-rotundum distance). The images were also examined for evidence of: erosion, defined as loss of the normal thin bony margin on at least two contiguous sections; apparent thinning of the sinus wall, defined as a focal apparent decrease in thickness again on at least two contiguous sections; and for vidian9s canal or foramen rotundum rim erosion or flattening.&lt;/p&gt;&lt;p&gt;&lt;i&gt;RESULTS:&lt;/i&gt; Of the seven patients with expansile lesions, vidian9s canal margin erosion was present in seven, unequivocal sinus expansion in three, wall erosion in three, wall thinning in three, erosion of the foramen rotundum in two, and flattening in the foramen rotundum in four. Forty-one of the 72 controls had lateral recess formation, 28 of which were asymmetric. The distance between vidian9s canal and the foramen rotundum (vidian-rotundum distance) relied on the presence or absence of pneumatization, with a significantly larger distance in the presence of greater wing pneumatization. Examination of 24 controls revealed apparent thinning of the sinus wall, typically at the carotid groove, but no flattening, thinning, or erosion of the vidian canal or of the foramen rotundum.&lt;/p&gt;&lt;p&gt;&lt;i&gt;CONCLUSION:&lt;/i&gt; Examination of controls and patients with expansile or erosive lesions of the sphenoid sinus revealed side-to-side asymmetry in the development of the sinus and lateral recess, making subtle expansion difficult to assess. Furthermore, variability in the vidian-rotundum distance correlated with degree of pneumatization, and did not necessarily reflect expansion. Thus, in the absence of gross sinus wall erosion, flattening or erosion of the rims of vidian9s canal or the foramen rotundum provides the most specific evidence of an expansile or erosive process within the sinus.&lt;/p&gt;" />
<meta name="citation_journal_title" content="American Journal of Neuroradiology" />
<meta name="citation_publisher" content="American Journal of Neuroradiology" />
<meta name="citation_publication_date" content="1999/03/01" />
<meta name="citation_mjid" content="ajnr;20/3/461" />
<meta name="citation_id" content="20/3/461" />
<meta name="citation_public_url" content="http://ajnr-stage2.stage.highwire.org/content/20/3/461" />
<meta name="citation_abstract_html_url" content="http://ajnr-stage2.stage.highwire.org/content/20/3/461.abstract" />
<meta name="citation_full_html_url" content="http://ajnr-stage2.stage.highwire.org/content/20/3/461.full" />
<meta name="citation_pdf_url" content="http://ajnr-stage2.stage.highwire.org/content/ajnr/20/3/461.full.pdf" />
<meta name="citation_issn" content="0195-6108" />
<meta name="citation_issn" content="1936-959X" />
<meta name="citation_pmid" content="10219412" />
<meta name="citation_volume" content="20" />
<meta name="citation_issue" content="3" />
<meta name="citation_article_type" content="Research Article" />
<meta name="citation_section" content="HEAD AND NECK" />
<meta name="citation_firstpage" content="461" />
<meta name="citation_lastpage" content="466" />
<meta name="citation_author" content="Jonathan S. Lewin" />
<meta name="citation_author" content="Hugh D. Curtin" />
<meta name="citation_author" content="Elizabeth Eelkema" />
<meta name="citation_author" content="Nancy Obuchowski" />
<meta name="citation_reference" content="citation_title=Ann Otol Rhinol Laryngol;citation_pages=738;citation_volume=4;citation_year=1995" />
<meta name="citation_reference" content="citation_title=Head &amp; neck;citation_journal_abbrev=Head Neck;citation_title=Sphenoid mucocele with intracranial invasion secondary to nasopharyngeal acinic cell carcinoma.;citation_pages=540-544;citation_volume=13;citation_year=1991;citation_issue=6;citation_pmid=1791147" />
<meta name="citation_reference" content="citation_title=American Journal of Roentgenology;citation_journal_abbrev=Am. J. Roentgenol.;citation_title=TOMOGRAPHY IN THE DIAGNOSIS OF SPHENOID SINUS MUCOCELE (SSM);citation_pages=587-591;citation_volume=115(3);citation_year=1972;citation_issue=3;citation_issn=0361-803X" />
<meta name="citation_reference" content="citation_title=American Journal of Roentgenology;citation_journal_abbrev=Am. J. Roentgenol.;citation_title=Sphenoethmoidal mucocele: radiographic diagnosis;citation_pages=595-599;citation_volume=127;citation_year=1976;citation_issue=4;citation_issn=0361-803X;citation_pmid=970529" />
<meta name="citation_reference" content="citation_title=The Laryngoscope;citation_journal_abbrev=Laryngoscope;citation_title=Benign nasal polyps causing bone destruction in the nasal cavity and paranasal sinuses.;citation_pages=675-679;citation_volume=88;citation_year=1978;citation_issue=4;citation_pmid=642664" />
<meta name="citation_reference" content="citation_title=Radiology;citation_journal_abbrev=Radiology;citation_title=Tomography in Expansile Lesions of the Nasal and Paranasal Sinuses;citation_pages=149-158;citation_volume=125;citation_year=1977;citation_issue=1;citation_issn=0033-8419;citation_pmid=197566;citation_doi=10.1148/125.1.149" />
<meta name="citation_reference" content="citation_title=American Journal of Neuroradiology;citation_journal_abbrev=Am. J. Neuroradiol.;citation_title=Pneumosinus dilatans of the sphenoid sinus.;citation_pages=865-868;citation_volume=7;citation_year=1986;citation_issue=5;citation_issn=0195-6108;citation_pmid=3096105" />
<meta name="citation_reference" content="citation_title=Journal of Anatomy;citation_journal_abbrev=Journal of Anatomy;citation_title=The Internal Structure of the Sphenoidal Sinus.;citation_pages=127-136;citation_volume=51;citation_year=1917;citation_issue=Pt 2;citation_pmid=17103809" />
<meta name="citation_reference" content="citation_title=American Journal of Roentgenology;citation_journal_abbrev=Am. J. Roentgenol.;citation_title=THE POSTNATAL DEVELOPMENT OF THE SPHENOIDAL SINUS AND ITS SPREAD INTO THE DORSUM SELLAE AND POSTERIOR CLINOID PROCESSES;citation_pages=177-183;citation_volume=104;citation_year=1968;citation_issue=1;citation_issn=0361-803X" />
<meta name="citation_reference" content="citation_title=Radiology;citation_journal_abbrev=Radiology;citation_title=The Sphenoidal Sinuses: Radiographic Patterns of Normal Development and Abnormal Findings in Infants and Children;citation_pages=133-136;citation_volume=129;citation_year=1978;citation_issue=1;citation_issn=0033-8419;citation_pmid=693864;citation_doi=10.1148/129.1.133" />
<meta name="citation_reference" content="citation_title=European archives of oto-rhino-laryngology :  official journal of the European Federation of Oto-Rhino-Laryngological Societies (EUFOS) : affiliated with the German Society for Oto-Rhino-Laryngology - Head and Neck Surgery;citation_journal_abbrev=Eur Arch Otorhinolaryngol;citation_title=Variations of the ethmoid labyrinth and sphenoid sinus and CT imaging.;citation_pages=209-212;citation_volume=250;citation_year=1993;citation_issue=4;citation_pmid=8369115" />
<meta name="citation_reference" content="citation_title=Surgical and radiologic anatomy :  SRA;citation_journal_abbrev=Surg Radiol Anat;citation_title=The sphenoid sinus during childhood: establishment of normal developmental standards by MRI.;citation_pages=193-198;citation_volume=16;citation_year=1994;citation_issue=2;citation_pmid=7940084" />
<meta name="citation_reference" content="citation_title=Journal of the Canadian Association of Radiologists;citation_journal_abbrev=J Can Assoc Radiol;citation_title=Patterns of pneumatization and septation of the sphenoidal sinus.;citation_pages=291-293;citation_volume=34;citation_year=1983;citation_issue=4;citation_pmid=6668290" />
<meta name="citation_reference" content="citation_title=The Journal of laryngology and otology;citation_journal_abbrev=J Laryngol Otol;citation_title=Surgical anatomy of the sphenoid sinus.;citation_pages=227-241;citation_volume=97;citation_year=1983;citation_issue=3;citation_pmid=6833847" />
<meta name="citation_reference" content="citation_title=The Laryngoscope;citation_journal_abbrev=Laryngoscope;citation_title=Preoperative laminagraphic evaluation of the sphenoid sinus for transsphenoidal surgery.;citation_pages=1986-1998;citation_volume=85;citation_year=1975;citation_issue=12 pt 1;citation_pmid=1105038" />
<meta name="citation_reference" content="citation_title=Journal of neurosurgery;citation_journal_abbrev=J Neurosurg;citation_title=Microsurgical anatomy of the sellar region.;citation_pages=288-298;citation_volume=43;citation_year=1975;citation_issue=3;citation_pmid=1151464" />
<meta name="twitter:title" content="Benign Expansile Lesions of the Sphenoid Sinus: Differentiation from Normal Asymmetry of the Lateral Recesses" />
<meta name="twitter:card" content="summary" />
<meta name="twitter:description" content="BACKGROUND AND PURPOSE : There is a wide range of normal variation in sphenoid sinus development, especially in the size of the lateral recesses. The purpose of this study was to determine imaging characteristics that may help differentiate between opacification of a developmentally asymmetric lateral recess and a true expansile lesion of the sphenoid sinus.

METHODS: Coronal CT was performed in seven patients with expansile or erosive benign lesions of the sphenoid sinus, and results were compared to a control population of 72 subjects with unopacified sphenoid sinuses. The degree of asymmetry of lateral recess development was assessed with particular attention to the separation of vidian's canal and the foramen rotundum (vidian-rotundum distance). The images were also examined for evidence of: erosion, defined as loss of the normal thin bony margin on at least two contiguous sections; apparent thinning of the sinus wall, defined as a focal apparent decrease in thickness again on at least two contiguous sections; and for vidian's canal or foramen rotundum rim erosion or flattening.

RESULTS: Of the seven patients with expansile lesions, vidian's canal margin erosion was present in seven, unequivocal sinus expansion in three, wall erosion in three, wall thinning in three, erosion of the foramen rotundum in two, and flattening in the foramen rotundum in four. Forty-one of the 72 controls had lateral recess formation, 28 of which were asymmetric. The distance between vidian's canal and the foramen rotundum (vidian-rotundum distance) relied on the presence or absence of pneumatization, with a significantly larger distance in the presence of greater wing pneumatization. Examination of 24 controls revealed apparent thinning of the sinus wall, typically at the carotid groove, but no flattening, thinning, or erosion of the vidian canal or of the foramen rotundum.

CONCLUSION: Examination of controls and patients with expansile or erosive lesions of the sphenoid sinus revealed side-to-side asymmetry in the development of the sinus and lateral recess, making subtle expansion difficult to assess. Furthermore, variability in the vidian-rotundum distance correlated with degree of pneumatization, and did not necessarily reflect expansion. Thus, in the absence of gross sinus wall erosion, flattening or erosion of the rims of vidian's canal or the foramen rotundum provides the most specific evidence of an expansile or erosive process within the sinus." />
<meta name="og-title" property="og:title" content="Benign Expansile Lesions of the Sphenoid Sinus: Differentiation from Normal Asymmetry of the Lateral Recesses" />
<meta name="og-url" property="og:url" content="http://ajnr-stage2.stage.highwire.org/content/20/3/461" />
<meta name="og-site-name" property="og:site_name" content="American Journal of Neuroradiology" />
<meta name="og-description" property="og:description" content="BACKGROUND AND PURPOSE : There is a wide range of normal variation in sphenoid sinus development, especially in the size of the lateral recesses. The purpose of this study was to determine imaging characteristics that may help differentiate between opacification of a developmentally asymmetric lateral recess and a true expansile lesion of the sphenoid sinus.

METHODS: Coronal CT was performed in seven patients with expansile or erosive benign lesions of the sphenoid sinus, and results were compared to a control population of 72 subjects with unopacified sphenoid sinuses. The degree of asymmetry of lateral recess development was assessed with particular attention to the separation of vidian's canal and the foramen rotundum (vidian-rotundum distance). The images were also examined for evidence of: erosion, defined as loss of the normal thin bony margin on at least two contiguous sections; apparent thinning of the sinus wall, defined as a focal apparent decrease in thickness again on at least two contiguous sections; and for vidian's canal or foramen rotundum rim erosion or flattening.

RESULTS: Of the seven patients with expansile lesions, vidian's canal margin erosion was present in seven, unequivocal sinus expansion in three, wall erosion in three, wall thinning in three, erosion of the foramen rotundum in two, and flattening in the foramen rotundum in four. Forty-one of the 72 controls had lateral recess formation, 28 of which were asymmetric. The distance between vidian's canal and the foramen rotundum (vidian-rotundum distance) relied on the presence or absence of pneumatization, with a significantly larger distance in the presence of greater wing pneumatization. Examination of 24 controls revealed apparent thinning of the sinus wall, typically at the carotid groove, but no flattening, thinning, or erosion of the vidian canal or of the foramen rotundum.

CONCLUSION: Examination of controls and patients with expansile or erosive lesions of the sphenoid sinus revealed side-to-side asymmetry in the development of the sinus and lateral recess, making subtle expansion difficult to assess. Furthermore, variability in the vidian-rotundum distance correlated with degree of pneumatization, and did not necessarily reflect expansion. Thus, in the absence of gross sinus wall erosion, flattening or erosion of the rims of vidian's canal or the foramen rotundum provides the most specific evidence of an expansile or erosive process within the sinus." />
<meta name="og-type" property="og:type" content="article" />
<meta name="og-image" property="og:image" content="" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<link rel="alternate" type="application/vnd.ms-powerpoint" title="Powerpoint" href="/content/20/3/461.ppt" />
<link rel="alternate" type="text/plain" title="Full Text (Plain)" href="/content/20/3/461.full.txt" />
<link rel="alternate" type="application/pdf" title="Full Text (PDF)" href="/content/20/3/461.full.pdf" />
<link rel="canonical" href="http://ajnr-stage2.stage.highwire.org/content/20/3/461" />
<script>window.dataLayer = window.dataLayer || [];window.dataLayer.push({"page":{"hwTitle":"Benign Expansile Lesions of the Sphenoid Sinus: Differentiation from Normal Asymmetry of the Lateral Recesses","hwUrl":"http://ajnr-stage2.stage.highwire.org/content/20/3/461","hwPath":"/content/20/3/461.abstract","hwType":"journal page"},"user":{"hwMemberID":"","hwLoggedIntoInstitutionID":"","hwLoggedIntoInstitution":"","hwAccessUsageTerms":"guest","hwRegisteredUser":"no","hwHasFullTextAccess":"yes","hwEntitled":"no"},"content":{"hwIssueDate":"1999-03-01","hwIssueDateTime":"1999-03-01 00:00:00","hwPublicationDate":"1999-03-01","hwPublicationDateTime":"1999-03-01 00:00:00","hwNlmArticleType":"research-article","hwDOI":"","hwAuthors":"Jonathan S. Lewin,Hugh D. Curtin,Elizabeth Eelkema,Nancy Obuchowski","hwContributors":"","hwIsEarlyRelease":"no","hwEissn":"1936-959X","hwPissn":"0195-6108","hwVolume":"20","hwIssue":"3","hwArticleType":"HEAD AND NECK","hwTabView":"main_tab","hwViewType":"abstract","hwAccessType":"Free","hwOpenAccess":"no","hwFreeAccess":"yes","hwTaxonomy":"","hwCorpusCode":"ajnr","hwType":"article","hwSubtitle":null,"hwOverline":null,"hwPisaId":"ajnr;20/3/461","hwFirstPage":"461","hwLastPage":"466","hwIsLatestVersion":"yes","hwIsCurrentIssue":"no","hwIsOpenIssue":"no","hwHasFullText":"yes","hwHasPDF":"yes","hwParentTitle":"American Journal of Neuroradiology: 20 (3)","hwElectronicPubDate":"1999-03-01","hwElectronicPubDateTime":"1999-03-01 00:00:00"}});
//--><!]]></script>
    <title>Benign Expansile Lesions of the Sphenoid Sinus: Differentiation from Normal Asymmetry of the Lateral Recesses | American Journal of Neuroradiology</title>  
    <link type="text/css" rel="stylesheet" href="/sites/default/files/advagg_css/css__BJ6Ou6QsBRtnFTmxaakamOIS8n4QswDP2XnnZ1sxtaM__NBuvkP6eInGIkb1aJvUHx5PX79XApuxBDkk_77W5tYk__Op4k-kV4DoWc7bsUP7umKmZ0WXfmoYdRDoZFPNSd-oM.css" media="all" />
<link type="text/css" rel="stylesheet" href="/sites/default/files/advagg_css/css__azeXjFYQUa4gTbdEg4sgM2osudOlAYwVv6vNmRXI3ac__zr83wx5lNxUVx-jSIFm8RDKOeMAB7RbaBxriFHS3dt4__Op4k-kV4DoWc7bsUP7umKmZ0WXfmoYdRDoZFPNSd-oM.css" media="all" />
<link type="text/css" rel="stylesheet" href="/sites/default/files/advagg_css/css__Ep75tNOnm8H2Mejav16FnGCfM1sLwyporbQrCIgwg3g__vXGjszfa0bvxzymQ8Cfns-o2huFvm80jp3igN8XcYeI__Op4k-kV4DoWc7bsUP7umKmZ0WXfmoYdRDoZFPNSd-oM.css" media="all" />
<link type="text/css" rel="stylesheet" href="/sites/default/files/advagg_css/css__TKi6DXKzgLPdEthh1Tnc63zY1QF4rLZHoM06Xy7VN6g__zaEHphFiBcrl8WVy_4n080y02dQ7HKxd_aqZbYgQ5Z0__Op4k-kV4DoWc7bsUP7umKmZ0WXfmoYdRDoZFPNSd-oM.css" media="all" />
<link type="text/css" rel="stylesheet" href="/sites/all/modules/highwire/highwire/highwire.style.highwire.css?sycxuq" media="all" />
<link type="text/css" rel="stylesheet" href="/sites/default/files/advagg_css/css__368m7sVtRu23rjqTxGZiVyTf_Vgj9GfVKn_6XVu-Ktw__awmYo-4mw13F7nmNUNtBYLumKanDZb8salegB2jkN90__Op4k-kV4DoWc7bsUP7umKmZ0WXfmoYdRDoZFPNSd-oM.css" media="all" />
<link type="text/css" rel="stylesheet" href="//cdn.jsdelivr.net/qtip2/2.2.1/jquery.qtip.min.css" media="all" />
<link type="text/css" rel="stylesheet" href="/sites/default/files/advagg_css/css__hdrV1jPSgxW0fPsRrK3sQAuhpElWcUo2f4JtkNIdb-Y__EwYsXwfG_cT9y3A9Cx4FsJxJRuF38Um_dApnuovtq68__Op4k-kV4DoWc7bsUP7umKmZ0WXfmoYdRDoZFPNSd-oM.css" media="all" />
<style type="text/css" media="all">
/* <![CDATA[ */
#sliding-popup.sliding-popup-bottom,#sliding-popup.sliding-popup-bottom .eu-cookie-withdraw-banner,.eu-cookie-withdraw-tab{background:#000000;}#sliding-popup.sliding-popup-bottom.eu-cookie-withdraw-wrapper{background:transparent}#sliding-popup .popup-content #popup-text h1,#sliding-popup .popup-content #popup-text h2,#sliding-popup .popup-content #popup-text h3,#sliding-popup .popup-content #popup-text p,.eu-cookie-compliance-secondary-button,.eu-cookie-withdraw-tab{color:#ffffff !important;}.eu-cookie-withdraw-tab{border-color:#ffffff;}.eu-cookie-compliance-more-button{color:#ffffff !important;}

/* ]]> */
</style>

<!--[if lte IE 7]>
<link type="text/css" rel="stylesheet" href="/sites/default/files/advagg_css/css__ElJr3PIJEvw3qLXc1cnYiLj2G4KgDPSXFOfm6Phf8hw__JdWGm15cDWjsK6KrFlQVXQix9YgNeYysf22XZHj-Y-c__Op4k-kV4DoWc7bsUP7umKmZ0WXfmoYdRDoZFPNSd-oM.css" media="all" />
<![endif]-->
<link type="text/css" rel="stylesheet" href="/sites/default/files/advagg_css/css__Wnlyen9qEpwh_Qaf9okEu4QdVGM0BDothxeqA6Nbvo8__EJmw6SZD9bYoS8jocCpPYS3JFRURpdzmuvJoAUNiI-g__Op4k-kV4DoWc7bsUP7umKmZ0WXfmoYdRDoZFPNSd-oM.css" media="all" />
<link type="text/css" rel="stylesheet" href="/sites/default/files/advagg_css/css__nv7Hafs9UucfV8bmT4epWF4zWAFU2G9JLHVgOOHDqbA__k9QUw6MohZGXV0YlzqvUpPTbyzhbizsKOi4x3aA7Tx0__Op4k-kV4DoWc7bsUP7umKmZ0WXfmoYdRDoZFPNSd-oM.css" media="all" />

<!--[if (lt IE 9)&(!IEMobile)]>
<link type="text/css" rel="stylesheet" href="/sites/default/files/advagg_css/css__XH6bpcI0f2dImc-p674DLCZtWBGb-QwxJK1YexVGtno__vUceGprdo5nIhV6DH93X7fI3r8RcTJbChbas9TQXeW4__Op4k-kV4DoWc7bsUP7umKmZ0WXfmoYdRDoZFPNSd-oM.css" media="all" />
<![endif]-->

<!--[if gte IE 9]><!-->
<link type="text/css" rel="stylesheet" href="/sites/default/files/advagg_css/css__2WBMox6sOrN42ss5lCnH7WWVRdFdJCxtTKnQJYRwTE4__yqNvNYLvMpjy3ffuJrjjm9uW2i-Me1c23KLYuWHaqio__Op4k-kV4DoWc7bsUP7umKmZ0WXfmoYdRDoZFPNSd-oM.css" media="all" />
<!--<![endif]-->
<link type="text/css" rel="stylesheet" href="/sites/default/files/advagg_css/css__wxg7u6KrkAKrph8zjmzjNAiqxtVP2vhMWX2NZ6DPPZE__ECvRNuvDf2Tm_Pc-j1mEkt48QjmIz2s2CyWDspWAhhI__Op4k-kV4DoWc7bsUP7umKmZ0WXfmoYdRDoZFPNSd-oM.css" media="all" />
    <script type="text/javascript">
<!--//--><![CDATA[//><!--
/*!
 * yepnope1.5.4
 * (c) WTFPL, GPLv2
 */
(function(a,b,c){function d(a){return"[object Function]"==o.call(a)}function e(a){return"string"==typeof a}function f(){}function g(a){return!a||"loaded"==a||"complete"==a||"uninitialized"==a}function h(){var a=p.shift();q=1,a?a.t?m(function(){("c"==a.t?B.injectCss:B.injectJs)(a.s,0,a.a,a.x,a.e,1)},0):(a(),h()):q=0}function i(a,c,d,e,f,i,j){function k(b){if(!o&&g(l.readyState)&&(u.r=o=1,!q&&h(),l.onload=l.onreadystatechange=null,b)){"img"!=a&&m(function(){t.removeChild(l)},50);for(var d in y[c])y[c].hasOwnProperty(d)&&y[c][d].onload()}}var j=j||B.errorTimeout,l=b.createElement(a),o=0,r=0,u={t:d,s:c,e:f,a:i,x:j};1===y[c]&&(r=1,y[c]=[]),"object"==a?l.data=c:(l.src=c,l.type=a),l.width=l.height="0",l.onerror=l.onload=l.onreadystatechange=function(){k.call(this,r)},p.splice(e,0,u),"img"!=a&&(r||2===y[c]?(t.insertBefore(l,s?null:n),m(k,j)):y[c].push(l))}function j(a,b,c,d,f){return q=0,b=b||"j",e(a)?i("c"==b?v:u,a,b,this.i++,c,d,f):(p.splice(this.i++,0,a),1==p.length&&h()),this}function k(){var a=B;return a.loader={load:j,i:0},a}var l=b.documentElement,m=a.setTimeout,n=b.getElementsByTagName("script")[0],o={}.toString,p=[],q=0,r="MozAppearance"in l.style,s=r&&!!b.createRange().compareNode,t=s?l:n.parentNode,l=a.opera&&"[object Opera]"==o.call(a.opera),l=!!b.attachEvent&&!l,u=r?"object":l?"script":"img",v=l?"script":u,w=Array.isArray||function(a){return"[object Array]"==o.call(a)},x=[],y={},z={timeout:function(a,b){return b.length&&(a.timeout=b[0]),a}},A,B;B=function(a){function b(a){var a=a.split("!"),b=x.length,c=a.pop(),d=a.length,c={url:c,origUrl:c,prefixes:a},e,f,g;for(f=0;f<d;f++)g=a[f].split("="),(e=z[g.shift()])&&(c=e(c,g));for(f=0;f<b;f++)c=x[f](c);return c}function g(a,e,f,g,h){var i=b(a),j=i.autoCallback;i.url.split(".").pop().split("?").shift(),i.bypass||(e&&(e=d(e)?e:e[a]||e[g]||e[a.split("/").pop().split("?")[0]]),i.instead?i.instead(a,e,f,g,h):(y[i.url]?i.noexec=!0:y[i.url]=1,f.load(i.url,i.forceCSS||!i.forceJS&&"css"==i.url.split(".").pop().split("?").shift()?"c":c,i.noexec,i.attrs,i.timeout),(d(e)||d(j))&&f.load(function(){k(),e&&e(i.origUrl,h,g),j&&j(i.origUrl,h,g),y[i.url]=2})))}function h(a,b){function c(a,c){if(a){if(e(a))c||(j=function(){var a=[].slice.call(arguments);k.apply(this,a),l()}),g(a,j,b,0,h);else if(Object(a)===a)for(n in m=function(){var b=0,c;for(c in a)a.hasOwnProperty(c)&&b++;return b}(),a)a.hasOwnProperty(n)&&(!c&&!--m&&(d(j)?j=function(){var a=[].slice.call(arguments);k.apply(this,a),l()}:j[n]=function(a){return function(){var b=[].slice.call(arguments);a&&a.apply(this,b),l()}}(k[n])),g(a[n],j,b,n,h))}else!c&&l()}var h=!!a.test,i=a.load||a.both,j=a.callback||f,k=j,l=a.complete||f,m,n;c(h?a.yep:a.nope,!!i),i&&c(i)}var i,j,l=this.yepnope.loader;if(e(a))g(a,0,l,0);else if(w(a))for(i=0;i<a.length;i++)j=a[i],e(j)?g(j,0,l,0):w(j)?B(j):Object(j)===j&&h(j,l);else Object(a)===a&&h(a,l)},B.addPrefix=function(a,b){z[a]=b},B.addFilter=function(a){x.push(a)},B.errorTimeout=1e4,null==b.readyState&&b.addEventListener&&(b.readyState="loading",b.addEventListener("DOMContentLoaded",A=function(){b.removeEventListener("DOMContentLoaded",A,0),b.readyState="complete"},0)),a.yepnope=k(),a.yepnope.executeStack=h,a.yepnope.injectJs=function(a,c,d,e,i,j){var k=b.createElement("script"),l,o,e=e||B.errorTimeout;k.src=a;for(o in d)k.setAttribute(o,d[o]);c=j?h:c||f,k.onreadystatechange=k.onload=function(){!l&&g(k.readyState)&&(l=1,c(),k.onload=k.onreadystatechange=null)},m(function(){l||(l=1,c(1))},e),i?k.onload():n.parentNode.insertBefore(k,n)},a.yepnope.injectCss=function(a,c,d,e,g,i){var e=b.createElement("link"),j,c=i?h:c||f;e.href=a,e.rel="stylesheet",e.type="text/css";for(j in d)e.setAttribute(j,d[j]);g||(n.parentNode.insertBefore(e,n),m(c,0))}})(this,document);

//--><!]]>
</script>
<script type="text/javascript" src="/sites/all/libraries/modernizr/modernizr.min.js?sycxuq"></script>
<script type="text/javascript">
<!--//--><![CDATA[//><!--
yepnope({
  test: Modernizr.matchmedia,
  nope: '/sites/all/libraries/media-match/media.match.min.js'
});
//--><!]]>
</script>
<script type="text/javascript" src="/sites/default/files/advagg_js/js__wH8myWXKi4A-QKdUKDXzJAnGs-FRS1A2ZzTTNzjRAdI__4MCtOZK_Ov0QKyRlXNLGQ2LRlYRGWj9ArT-NpFox3QA__Op4k-kV4DoWc7bsUP7umKmZ0WXfmoYdRDoZFPNSd-oM.js"></script>
<script type="text/javascript">
<!--//--><![CDATA[//><!--
var googletag = googletag || {};
googletag.cmd = googletag.cmd || [];
googletag.slots = googletag.slots || {};
//--><!]]>
</script>
<script type="text/javascript" src="//securepubads.g.doubleclick.net/tag/js/gpt.js"></script>
<script type="text/javascript" src="/sites/default/files/advagg_js/js__9ici6QMeDS-cROq8R0RhuICsMGMP2wcJZNQQFsqQi44__kScSwG4RXGl1LXnj4qqt0ZxtNX4Gh2TK5W-o8Uup4SA__Op4k-kV4DoWc7bsUP7umKmZ0WXfmoYdRDoZFPNSd-oM.js"></script>
<script type="text/javascript" src="/sites/default/files/advagg_js/js__fwhbnUWIxW-jFl55E2mBYVtZTjGhJ1JWyZYAJ2cEd3A__jCrCuWCJIPYPe1FzZoUvsJWEjkNMmRIQHYek1h7idBE__Op4k-kV4DoWc7bsUP7umKmZ0WXfmoYdRDoZFPNSd-oM.js"></script>
<script type="text/javascript">
<!--//--><![CDATA[//><!--
googletag.slots["rhs"] = googletag.defineSlot("/446583111/RHS_300x250", [300, 250], "dfp-ad-rhs")
  .addService(googletag.pubads());
//--><!]]>
</script>
<script type="text/javascript" src="/sites/default/files/advagg_js/js__UR8BHznwml64Vq0ijSGFwlm-xe9ttj1aripHInFCOLw__irCalsu-H_fRTOPqjyCv1O8Ax7fqY6DDf-uMOV1dvGY__Op4k-kV4DoWc7bsUP7umKmZ0WXfmoYdRDoZFPNSd-oM.js"></script>
<script type="text/javascript">
<!--//--><![CDATA[//><!--
var mapping = googletag.sizeMapping()
  .addSize([768, 0], [728, 90])
  .addSize([0, 0], [300, 50])
  .build();
googletag.slots["bottom_leaderboard"] = googletag.defineSlot("/446583111/Bottom_Banner_728x90", [[728, 90], [300, 50]], "dfp-ad-bottom_leaderboard")
  .addService(googletag.pubads())
  .defineSizeMapping(mapping);
//--><!]]>
</script>
<script type="text/javascript" src="/sites/default/files/advagg_js/js__bQc6kyz_Gw2afC1F6wguCBh8Z8nev-hxX6F2Tw4bq6k__CO2faEsYCquY82rVj6as9HScSnogGHeR-oh5fSQydG0__Op4k-kV4DoWc7bsUP7umKmZ0WXfmoYdRDoZFPNSd-oM.js"></script>
<script type="text/javascript">
<!--//--><![CDATA[//><!--
var mapping = googletag.sizeMapping()
  .addSize([768, 0], [728, 90])
  .addSize([0, 0], [300, 50])
  .build();
googletag.slots["top_leaderboard"] = googletag.defineSlot("/446583111/Top_Leaderboard_728x90", [[728, 90], [300, 50]], "dfp-ad-top_leaderboard")
  .addService(googletag.pubads())
  .defineSizeMapping(mapping);
//--><!]]>
</script>
<script type="text/javascript" src="/sites/default/files/advagg_js/js__wS6WUeF11NLeJgCqxc-dMvjhALAMQG1jlaeWdG8yVZc__CPiombDS21ooaYdmqHXdcMoJwB2FMn18JzO97LewQxc__Op4k-kV4DoWc7bsUP7umKmZ0WXfmoYdRDoZFPNSd-oM.js"></script>
<script type="text/javascript">
<!--//--><![CDATA[//><!--
document.createElement( "picture" );
//--><!]]>
</script>
<script type="text/javascript" src="/sites/default/files/advagg_js/js__UK1ygaa8bCfT-jsjqYRdRLDZ5N17950T7K5WPC9XtpI__NqLYT1T1SMBsKukLWIe82VgCZYYCMHZX_f609-a1rj8__Op4k-kV4DoWc7bsUP7umKmZ0WXfmoYdRDoZFPNSd-oM.js"></script>
<script type="text/javascript">
<!--//--><![CDATA[//><!--
googletag.cmd.push(function() {
  googletag.pubads().enableAsyncRendering();
  googletag.pubads().enableSingleRequest();
  googletag.pubads().collapseEmptyDivs();
  googletag.pubads().addEventListener("slotRenderEnded", function (event) {
    if (event.isEmpty) {
      var id = event.slot.getSlotElementId();
      var x = document.getElementById(id);
      if (x.parentElement.classList.contains("dfp-tag-wrapper")) {
        x.parentElement.style.display = "none";
      }
    }
  });
  googletag.pubads().setTargeting("page:hwTitle", "Benign Expansile Lesions of the Sphenoid Sinus: Differentiation from Normal Asymmetry of the Lateral Recesses");
  googletag.pubads().setTargeting("page:hwUrl", "http://ajnr-stage2.stage.highwire.org/content/20/3/461");
  googletag.pubads().setTargeting("page:hwPath", "/content/20/3/461.abstract");
  googletag.pubads().setTargeting("page:hwType", "journal page");
  googletag.pubads().setTargeting("user:hwAccessUsageTerms", "guest");
  googletag.pubads().setTargeting("user:hwRegisteredUser", "no");
  googletag.pubads().setTargeting("user:hwHasFullTextAccess", "yes");
  googletag.pubads().setTargeting("user:hwEntitled", "no");
  googletag.pubads().setTargeting("content:hwIssueDate", "1999-03-01");
  googletag.pubads().setTargeting("content:hwIssueDateTime", "1999-03-01 00:00:00");
  googletag.pubads().setTargeting("content:hwPublicationDate", "1999-03-01");
  googletag.pubads().setTargeting("content:hwPublicationDateTime", "1999-03-01 00:00:00");
  googletag.pubads().setTargeting("content:hwNlmArticleType", "research-article");
  googletag.pubads().setTargeting("content:hwAuthors", ["Jonathan S. Lewin","Hugh D. Curtin","Elizabeth Eelkema","Nancy Obuchowski"]);
  googletag.pubads().setTargeting("content:hwIsEarlyRelease", "no");
  googletag.pubads().setTargeting("content:hwEissn", "1936-959X");
  googletag.pubads().setTargeting("content:hwPissn", "0195-6108");
  googletag.pubads().setTargeting("content:hwVolume", "20");
  googletag.pubads().setTargeting("content:hwIssue", "3");
  googletag.pubads().setTargeting("content:hwArticleType", "HEAD AND NECK");
  googletag.pubads().setTargeting("content:hwTabView", "main_tab");
  googletag.pubads().setTargeting("content:hwViewType", "abstract");
  googletag.pubads().setTargeting("content:hwAccessType", "Free");
  googletag.pubads().setTargeting("content:hwOpenAccess", "no");
  googletag.pubads().setTargeting("content:hwFreeAccess", "yes");
  googletag.pubads().setTargeting("content:hwCorpusCode", "ajnr");
  googletag.pubads().setTargeting("content:hwType", "article");
  googletag.pubads().setTargeting("content:hwPisaId", "ajnr;20/3/461");
  googletag.pubads().setTargeting("content:hwFirstPage", "461");
  googletag.pubads().setTargeting("content:hwLastPage", "466");
  googletag.pubads().setTargeting("content:hwIsLatestVersion", "yes");
  googletag.pubads().setTargeting("content:hwIsCurrentIssue", "no");
  googletag.pubads().setTargeting("content:hwIsOpenIssue", "no");
  googletag.pubads().setTargeting("content:hwHasFullText", "yes");
  googletag.pubads().setTargeting("content:hwHasPDF", "yes");
  googletag.pubads().setTargeting("content:hwParentTitle", "American Journal of Neuroradiology: 20 (3)");
  googletag.pubads().setTargeting("content:hwElectronicPubDate", "1999-03-01");
  googletag.pubads().setTargeting("content:hwElectronicPubDateTime", "1999-03-01 00:00:00");
});

googletag.enableServices();
//--><!]]>
</script>
<script type="text/javascript" src="/sites/default/files/advagg_js/js__3vwOA0BwlnyBkt9H4CLg6FgNyKAh--OmfOxFOIu_5S4__EXTgktcHbQ7BQfelY6CnrqgPRc4i4eD6XcZ4i3xs5RU__Op4k-kV4DoWc7bsUP7umKmZ0WXfmoYdRDoZFPNSd-oM.js"></script>
<script type="text/javascript" async="async" src="https://scholar.google.com/scholar_js/casa.js"></script>
<script type="text/javascript" src="/sites/default/files/advagg_js/js__11OTRBANYp_FPYy8gxuWv8XYK780LivNl9ef5qg3rfw__TEVdNksA7-zrPiZwnenYHdToBjuVChsDlzQL_vP4NkY__Op4k-kV4DoWc7bsUP7umKmZ0WXfmoYdRDoZFPNSd-oM.js"></script>
<script type="text/javascript" src="//cdn.jsdelivr.net/qtip2/2.2.1/jquery.qtip.min.js"></script>
<script type="text/javascript" src="/sites/default/files/advagg_js/js__yiXGyyzC1oV2sZBtAUN2DFoM2mAH5KP0iYCqS1dmafE__UiTPqZo1iNHqhqhx1lKGu2xkUGpxmin5ny6_22C53JA__Op4k-kV4DoWc7bsUP7umKmZ0WXfmoYdRDoZFPNSd-oM.js"></script>
<script type="text/javascript">
<!--//--><![CDATA[//><!--
if(typeof window.MathJax === "undefined") window.MathJax = { menuSettings: { zoom: "Click" } };
//--><!]]>
</script>
<script type="text/javascript" src="/sites/default/files/advagg_js/js__gzglMimeshoybn5FdOUfx5zFIzXjSZCarAdAqdFwzb0__XnS2ZmP_Eu1FvGruois2GWaJM4qn-3H8Rt4VF8dvyrA__Op4k-kV4DoWc7bsUP7umKmZ0WXfmoYdRDoZFPNSd-oM.js"></script>
<script type="text/javascript" src="https://www.google.com/recaptcha/api.js?hl=en&amp;render=explicit&amp;onload=drupalRecaptchaOnload"></script>
<script type="text/javascript" src="/sites/default/files/advagg_js/js__HqKvnCDNMo-YAPie1hyUhsHT2zZv8Q-DTdZ7Y5G0fds__MOkbgqF8SI-u0Z_5FaIvk3ciKbdAECUW01goWYwk8t4__Op4k-kV4DoWc7bsUP7umKmZ0WXfmoYdRDoZFPNSd-oM.js"></script>
<script type="text/javascript" async="async" src="https://www.googletagmanager.com/gtag/js?id=G-4CRTLTY8KW"></script>
<script type="text/javascript">
<!--//--><![CDATA[//><!--
window.dataLayer = window.dataLayer || [];function gtag(){dataLayer.push(arguments)};gtag("js", new Date());gtag("set", "developer_id.dMDhkMT", true);gtag("config", "G-4CRTLTY8KW", {"groups":"default","anonymize_ip":true});
//--><!]]>
</script>
<script type="text/javascript" src="/sites/default/files/advagg_js/js__xwmR_XUqgIHdKocIkn2GiqYMVWJ0gY7OwpoARPRxEYM__CdSkXbn46iKUJfVct1nUx50N8MQ35eZOCMya9EuGbeU__Op4k-kV4DoWc7bsUP7umKmZ0WXfmoYdRDoZFPNSd-oM.js"></script>
<script type="text/javascript" src="/sites/default/files/advagg_js/js__156__G_TX0wWbp2x4EuISKOgbs4NaeHZ2KmXq85T6UI__w2izI_4UeJKq2XZJo79kNkQyxp_-2ptYjzA3YJcr-tg__Op4k-kV4DoWc7bsUP7umKmZ0WXfmoYdRDoZFPNSd-oM.js"></script>
<script type="text/javascript" src="/sites/default/files/advagg_js/js__az53Pz-SG0wejB-7UDzC-AbKqNFb4dAiZbq9Ymbj0sY__8FyXs8A34T1jX6OUXsgX27-4ASoy8QDncslXiOc2PK4__Op4k-kV4DoWc7bsUP7umKmZ0WXfmoYdRDoZFPNSd-oM.js"></script>
<script type="text/javascript">
<!--//--><![CDATA[//><!--
jQuery.extend(Drupal.settings, {"basePath":"\/","pathPrefix":"","ajaxPageState":{"theme":"jcore_1","theme_token":"eMU35AX5ZgZZJf6q0o1KvCIRw-NOfapIeSGpevBILzI","js":{"sites\/all\/libraries\/modernizr\/modernizr.min.js":1,"sites\/all\/modules\/contrib\/jquery_update\/replace\/jquery\/1.8\/jquery.min.js":1,"misc\/jquery-extend-3.4.0.js":1,"misc\/jquery.once.js":1,"misc\/drupal.js":1,"sites\/all\/modules\/contrib\/jquery_update\/replace\/ui\/ui\/minified\/jquery.ui.core.min.js":1,"sites\/all\/modules\/contrib\/jquery_update\/replace\/ui\/ui\/minified\/jquery.ui.widget.min.js":1,"sites\/all\/modules\/contrib\/jquery_update\/replace\/ui\/ui\/minified\/jquery.ui.button.min.js":1,"sites\/all\/modules\/contrib\/jquery_update\/replace\/ui\/ui\/minified\/jquery.ui.mouse.min.js":1,"sites\/all\/modules\/contrib\/jquery_update\/replace\/ui\/ui\/minified\/jquery.ui.draggable.min.js":1,"sites\/all\/modules\/contrib\/jquery_update\/replace\/ui\/ui\/minified\/jquery.ui.position.min.js":1,"sites\/all\/modules\/contrib\/jquery_update\/replace\/ui\/ui\/minified\/jquery.ui.resizable.min.js":1,"sites\/all\/modules\/contrib\/jquery_update\/replace\/ui\/ui\/minified\/jquery.ui.dialog.min.js":1,"sites\/all\/modules\/contrib\/jquery_update\/replace\/ui\/ui\/minified\/jquery.ui.tooltip.min.js":1,"sites\/all\/modules\/contrib\/jquery_update\/replace\/ui\/ui\/minified\/jquery.ui.accordion.min.js":1,"sites\/all\/libraries\/jquery.bgiframe\/jquery.bgiframe.js":1,"sites\/all\/libraries\/jquery.hoverIntent\/jquery.hoverIntent.js":1,"sites\/all\/libraries\/superfish\/superfish.js":1,"sites\/all\/modules\/contrib\/nice_menus\/js\/nice_menus.js":1,"sites\/all\/modules\/contrib\/eu_cookie_compliance\/js\/jquery.cookie-1.4.1.min.js":1,"sites\/all\/modules\/highwire\/highwire\/js\/highwire.equal-heights.js":1,"sites\/all\/modules\/highwire\/highwire\/js\/highwire.panels-ajax-tab.js":1,"sites\/all\/libraries\/colorbox\/jquery.colorbox-min.js":1,"sites\/all\/modules\/contrib\/colorbox\/js\/colorbox.js":1,"sites\/all\/modules\/contrib\/colorbox\/styles\/default\/colorbox_style.js":1,"https:\/\/scholar.google.com\/scholar_js\/casa.js":1,"sites\/all\/modules\/highwire\/highwire\/highwire_log\/highwire_log.js":1,"sites\/all\/modules\/highwire\/highwire\/highwire_user\/js\/highwire_user_meta.js":1,"sites\/all\/modules\/contrib\/panels_ajax_tab\/js\/panels_ajax_tab.js":1,"\/\/cdn.jsdelivr.net\/qtip2\/2.2.1\/jquery.qtip.min.js":1,"sites\/all\/modules\/highwire\/highwire\/plugins\/highwire_markup_process\/js\/highwire_article_reference_popup.js":1,"sites\/all\/modules\/highwire\/highwire\/plugins\/highwire_markup_process\/js\/highwire_at_symbol.js":1,"sites\/all\/modules\/contrib\/captcha\/captcha.js":1,"misc\/textarea.js":1,"sites\/all\/modules\/contrib\/recaptcha\/js\/recaptcha.js":1,"https:\/\/www.google.com\/recaptcha\/api.js?hl=en\u0026render=explicit\u0026onload=drupalRecaptchaOnload":1,"sites\/all\/modules\/highwire\/highwire\/highwire_citation\/plugins\/content_types\/js\/highwire_citation_export.js":1,"sites\/all\/modules\/highwire\/highwire\/plugins\/content_types\/js\/minipanel_dialog_link.js":1,"sites\/all\/modules\/highwire\/highwire\/plugins\/content_types\/js\/highwire_share_dialog.js":1,"sites\/all\/modules\/highwire\/highwire\/plugins\/content_types\/js\/clipboard.min.js":1,"sites\/all\/modules\/highwire\/highwire\/plugins\/content_types\/js\/highwire_clipboard.js":1,"sites\/all\/modules\/contrib\/service_links\/js\/twitter_button.js":1,"sites\/all\/modules\/contrib\/service_links\/js\/facebook_like.js":1,"sites\/all\/modules\/contrib\/service_links\/js\/google_plus_one.js":1,"sites\/all\/modules\/highwire\/highwire\/plugins\/content_types\/js\/highwire_article_nav.js":1,"sites\/all\/modules\/highwire\/highwire\/plugins\/content_types\/js\/highwire_nav_float.js":1,"sites\/all\/modules\/highwire\/highwire\/plugins\/content_types\/js\/highwire_citing_links.js":1,"sites\/all\/modules\/highwire\/highwire\/highwire_search\/plugins\/content_types\/js\/highwire_search_similar_articles.js":1,"sites\/all\/modules\/contrib\/panels_accordion\/js\/panels_accordion.js":1,"sites\/all\/modules\/highwire\/highwire\/js\/highwire.article-citation-access.js":1,"sites\/all\/modules\/highwire\/highwire\/js\/highwire.article-citation-author-tooltip.js":1,"sites\/all\/modules\/highwire\/highwire\/highwire_responsive\/plugins\/styles\/highwire_responsive_toggle\/highwire_responsive_toggle.js":1,"sites\/all\/modules\/contrib\/google_analytics\/googleanalytics.js":1,"https:\/\/www.googletagmanager.com\/gtag\/js?id=G-4CRTLTY8KW":1,"sites\/all\/themes\/highwire\/jcore_1\/js\/theme-scripts.js":1,"sites\/all\/modules\/highwire\/highwire\/highwire_responsive\/js\/highwire-mediaqueries.js":1,"sites\/all\/libraries\/enquire.js\/enquire.min.js":1,"sites\/all\/modules\/contrib\/picture\/picturefill2\/picturefill.min.js":1,"sites\/all\/modules\/contrib\/picture\/picture.min.js":1,"sites\/all\/modules\/highwire\/highwire\/plugins\/content_types\/js\/highwire_panels_ajax_tab.js":1,"sites\/all\/modules\/highwire\/highwire\/plugins\/highwire_markup_process\/js\/highwire_openurl.js":1,"sites\/all\/modules\/highwire\/highwire\/plugins\/highwire_markup_process\/js\/highwire_google_scholar_sprinkle.js":1,"sites\/all\/modules\/highwire\/highwire\/plugins\/content_types\/js\/highwire_article_trendmd.js":1,"sites\/all\/modules\/highwire\/highwire\/highwire_user\/plugins\/content_types\/js\/highwire_user_salutation.js":1,"sites\/all\/modules\/contrib\/eu_cookie_compliance\/js\/eu_cookie_compliance.js":1,"http:\/\/securepubads.g.doubleclick.net\/tag\/js\/gpt.js":1,"sites\/all\/modules\/highwire\/highwire\/js\/highwire.gtranslate.js":1,"sites\/all\/modules\/highwire\/highwire\/highwire_datalayer\/js\/highwire_datalayer.js":1,"sites\/all\/themes\/contrib\/omega\/omega\/js\/jquery.formalize.js":1,"sites\/all\/themes\/contrib\/omega\/omega\/js\/omega-mediaqueries.js":1,"sites\/all\/themes\/contrib\/omega\/omega\/js\/omega-equalheights.js":1},"css":{"modules\/system\/system.base.css":1,"modules\/system\/system.menus.css":1,"modules\/system\/system.messages.css":1,"modules\/system\/system.theme.css":1,"misc\/ui\/jquery.ui.core.css":1,"misc\/ui\/jquery.ui.theme.css":1,"misc\/ui\/jquery.ui.button.css":1,"misc\/ui\/jquery.ui.resizable.css":1,"misc\/ui\/jquery.ui.dialog.css":1,"misc\/ui\/jquery.ui.tooltip.css":1,"misc\/ui\/jquery.ui.accordion.css":1,"sites\/all\/modules\/contrib\/date\/date_api\/date.css":1,"sites\/all\/modules\/contrib\/date\/date_popup\/themes\/datepicker.1.7.css":1,"modules\/field\/theme\/field.css":1,"sites\/all\/modules\/highwire\/highwire\/highwire_draw\/css\/highwire-draw.css":1,"sites\/all\/modules\/highwire\/highwire\/highwire_folders\/highwire_folders.css":1,"sites\/all\/modules\/highwire\/highwire\/highwire_responsive\/css\/highwire-responsive.css":1,"sites\/all\/modules\/highwire\/highwire\/highwire_saved_searches\/highwire_saved_searches.css":1,"sites\/all\/modules\/highwire\/highwire\/highwire_user\/highwire_user.css":1,"modules\/node\/node.css":1,"sites\/all\/modules\/contrib\/picture\/picture_wysiwyg.css":1,"modules\/search\/search.css":1,"modules\/user\/user.css":1,"sites\/all\/modules\/contrib\/views\/css\/views.css":1,"sites\/all\/modules\/contrib\/ckeditor\/css\/ckeditor.css":1,"sites\/all\/modules\/contrib\/colorbox\/styles\/default\/colorbox_style.css":1,"sites\/all\/modules\/contrib\/ctools\/css\/ctools.css":1,"sites\/all\/modules\/contrib\/google_admanager\/google_admanager.css":1,"sites\/all\/modules\/highwire\/highwire\/highwire.style.highwire.css":1,"sites\/all\/modules\/highwire\/highwire\/css\/nlm-elements.css":1,"sites\/all\/modules\/contrib\/panels\/css\/panels.css":1,"public:\/\/ctools\/css\/263bfdb18936424f0ade19d6bd885f37.css":1,"sites\/all\/modules\/contrib\/panels_ajax_tab\/css\/panels_ajax_tab.css":1,"sites\/all\/modules\/highwire\/highwire\/plugins\/content_types\/css\/highwire_corrections.css":1,"sites\/all\/modules\/highwire\/highwire\/highwire.style.markup.css":1,"\/\/cdn.jsdelivr.net\/qtip2\/2.2.1\/jquery.qtip.min.css":1,"sites\/all\/modules\/highwire\/highwire\/plugins\/layouts\/highwire_2col_stacked\/highwire-2col-stacked.css":1,"sites\/all\/modules\/contrib\/forward\/forward.css":1,"sites\/all\/modules\/highwire\/highwire\/plugins\/content_types\/css\/highwire_share_link.css":1,"sites\/all\/modules\/highwire\/highwire\/plugins\/content_types\/css\/highwire_copy_permalink.css":1,"sites\/all\/modules\/highwire\/highwire\/plugins\/content_types\/css\/highwire_citing_links.css":1,"sites\/all\/modules\/highwire\/highwire\/plugins\/content_types\/css\/highwire_reports_feed.css":1,"sites\/all\/modules\/highwire\/highwire\/css\/highwire-article-citation-list.css":1,"sites\/all\/modules\/highwire\/highwire\/highwire_responsive\/plugins\/styles\/highwire_responsive_toggle\/highwire_responsive_toggle.css.less":1,"sites\/all\/modules\/contrib\/nice_menus\/css\/nice_menus.css":1,"sites\/all\/modules\/contrib\/nice_menus\/css\/nice_menus_default.css":1,"sites\/all\/modules\/contrib\/panels\/plugins\/layouts\/onecol\/onecol.css":1,"sites\/all\/modules\/contrib\/eu_cookie_compliance\/css\/eu_cookie_compliance.css":1,"sites\/all\/modules\/highwire\/highwire\/css\/highwire.gtranslate.css":1,"sites\/all\/modules\/highwire\/highwire\/highwire_theme_tools\/css\/font-hwicons.css":1,"sites\/all\/modules\/highwire\/highwire\/highwire_theme_tools\/css\/font-hwicons-glyphs.css":1,"sites\/all\/themes\/highwire\/jcore_1\/eu_cookie_compliance.css":1,"sites\/all\/themes\/highwire\/jcore_1\/css\/font-awesome-ie7.css":1,"sites\/all\/themes\/contrib\/omega\/alpha\/css\/alpha-reset.css":1,"sites\/all\/themes\/contrib\/omega\/alpha\/css\/alpha-mobile.css":1,"sites\/all\/themes\/contrib\/omega\/alpha\/css\/alpha-alpha.css":1,"sites\/all\/themes\/contrib\/omega\/omega\/css\/formalize.css":1,"sites\/all\/themes\/contrib\/omega\/omega\/css\/omega-text.css":1,"sites\/all\/themes\/contrib\/omega\/omega\/css\/omega-branding.css":1,"sites\/all\/themes\/contrib\/omega\/omega\/css\/omega-menu.css":1,"sites\/all\/themes\/contrib\/omega\/omega\/css\/omega-forms.css":1,"sites\/all\/modules\/highwire\/highwire\/css\/highwire-forms.css":1,"sites\/all\/themes\/highwire\/jcore_1\/css\/mobile-reset.css":1,"sites\/all\/themes\/highwire\/jcore_1\/css\/font-awesome.css":1,"sites\/all\/themes\/highwire\/jcore_1\/css\/forms.css":1,"sites\/all\/themes\/highwire\/jcore_1\/css\/global.css":1,"sites\/all\/themes\/highwire\/jcore_1\/css\/jquery-ui-elements.css":1,"sites\/all\/themes\/highwire\/jcore_1\/css\/text.css":1,"sites\/all\/themes\/highwire\/jcore_1\/css\/eletters.css":1,"sites\/all\/themes\/highwire\/jcore_1\/css\/colors.css.less":1,"ie::normal::sites\/all\/themes\/highwire\/jcore_1\/css\/jcore-1-jcore-default.css":1,"ie::normal::sites\/all\/themes\/highwire\/jcore_1\/css\/jcore-1-jcore-default-normal.css":1,"ie::normal::sites\/all\/themes\/highwire\/jcore_1\/css\/grid\/jcore_default\/normal\/jcore-default-normal-30.css":1,"narrow::sites\/all\/themes\/highwire\/jcore_1\/css\/jcore-1-jcore-default.css":1,"narrow::sites\/all\/themes\/highwire\/jcore_1\/css\/jcore-1-jcore-default-narrow.css":1,"sites\/all\/themes\/highwire\/jcore_1\/css\/grid\/jcore_default\/narrow\/jcore-default-narrow-30.css":1,"normal::sites\/all\/themes\/highwire\/jcore_1\/css\/jcore-1-jcore-default.css":1,"normal::sites\/all\/themes\/highwire\/jcore_1\/css\/jcore-1-jcore-default-normal.css":1,"sites\/all\/themes\/highwire\/jcore_1\/css\/grid\/jcore_default\/normal\/jcore-default-normal-30.css":1,"wide::sites\/all\/themes\/highwire\/jcore_1\/css\/jcore-1-jcore-default.css":1,"wide::sites\/all\/themes\/highwire\/jcore_1\/css\/jcore-1-jcore-default-wide.css":1,"sites\/all\/themes\/highwire\/jcore_1\/css\/grid\/jcore_default\/wide\/jcore-default-wide-30.css":1,"sites\/all\/modules\/shared\/jnl_ajnr_styles\/css\/jnl-ajnr-styles.css.less":1,"sites\/all\/modules\/shared\/jnl_ajnr_styles\/css\/jnl-ajnr-breakpoints.css.less":1}},"colorbox":{"opacity":"0.85","current":"{current} of {total}","previous":"\u00ab Prev","next":"Next \u00bb","close":"Close","maxWidth":"98%","maxHeight":"98%","fixed":true,"mobiledetect":true,"mobiledevicewidth":"480px"},"highwire":{"markup":[{"requested":"short-text","variant":"abstract","view":"abstract","pisa":"ajnr;20\/3\/461"},{"requested":"short-text","variant":"abstract","view":"abstract","pisa":"ajnr;20\/3\/461"},{"requested":"abstract","variant":"abstract","view":"abstract","pisa":"ajnr;20\/3\/461"},{"requested":"full-text","variant":"full-text","view":"full","pisa":"ajnr;20\/3\/461"}],"nid":"11219","apath":"\/ajnr\/20\/3\/461.atom","pisa":"ajnr;20\/3\/461","ac":{"\/ajnr\/20\/3\/461.atom":{"access":{"full":true,"reprint":true,"abstract":true},"pisa_id":"","apath":"\/ajnr\/20\/3\/461.atom","jcode":"ajnr"},"ajnr;20\/3\/461":{"access":{"full":true},"pisa_id":"ajnr;20\/3\/461","apath":"","jcode":"ajnr"}},"processed":["highwire_math"],"trendmd":{"trendmd-suggestions":"{\u0022element\u0022:\u0022#trendmd-suggestions\u0022,\u0022track_id\u0022:\u0022null\u0022}"},"modal_window_width":"560","share_modal_width":"560","share_modal_title":"Share this Article","dataLayer":"{\u0022page\u0022:{\u0022hwTitle\u0022:\u0022Benign Expansile Lesions of the Sphenoid Sinus: Differentiation from Normal Asymmetry of the Lateral Recesses\u0022,\u0022hwUrl\u0022:\u0022http:\\\/\\\/ajnr-stage2.stage.highwire.org\\\/content\\\/20\\\/3\\\/461\u0022,\u0022hwPath\u0022:\u0022\\\/content\\\/20\\\/3\\\/461.abstract\u0022,\u0022hwType\u0022:\u0022journal page\u0022},\u0022user\u0022:{\u0022hwMemberID\u0022:\u0022\u0022,\u0022hwLoggedIntoInstitutionID\u0022:\u0022\u0022,\u0022hwLoggedIntoInstitution\u0022:\u0022\u0022,\u0022hwAccessUsageTerms\u0022:\u0022guest\u0022,\u0022hwRegisteredUser\u0022:\u0022no\u0022,\u0022hwHasFullTextAccess\u0022:\u0022yes\u0022,\u0022hwEntitled\u0022:\u0022no\u0022},\u0022content\u0022:{\u0022hwIssueDate\u0022:\u00221999-03-01\u0022,\u0022hwIssueDateTime\u0022:\u00221999-03-01 00:00:00\u0022,\u0022hwPublicationDate\u0022:\u00221999-03-01\u0022,\u0022hwPublicationDateTime\u0022:\u00221999-03-01 00:00:00\u0022,\u0022hwNlmArticleType\u0022:\u0022research-article\u0022,\u0022hwDOI\u0022:\u0022\u0022,\u0022hwAuthors\u0022:\u0022Jonathan S. Lewin,Hugh D. Curtin,Elizabeth Eelkema,Nancy Obuchowski\u0022,\u0022hwContributors\u0022:\u0022\u0022,\u0022hwIsEarlyRelease\u0022:\u0022no\u0022,\u0022hwEissn\u0022:\u00221936-959X\u0022,\u0022hwPissn\u0022:\u00220195-6108\u0022,\u0022hwVolume\u0022:\u002220\u0022,\u0022hwIssue\u0022:\u00223\u0022,\u0022hwArticleType\u0022:\u0022HEAD AND NECK\u0022,\u0022hwTabView\u0022:\u0022main_tab\u0022,\u0022hwViewType\u0022:\u0022abstract\u0022,\u0022hwAccessType\u0022:\u0022Free\u0022,\u0022hwOpenAccess\u0022:\u0022no\u0022,\u0022hwFreeAccess\u0022:\u0022yes\u0022,\u0022hwTaxonomy\u0022:\u0022\u0022,\u0022hwCorpusCode\u0022:\u0022ajnr\u0022,\u0022hwType\u0022:\u0022article\u0022,\u0022hwSubtitle\u0022:null,\u0022hwOverline\u0022:null,\u0022hwPisaId\u0022:\u0022ajnr;20\\\/3\\\/461\u0022,\u0022hwFirstPage\u0022:\u0022461\u0022,\u0022hwLastPage\u0022:\u0022466\u0022,\u0022hwIsLatestVersion\u0022:\u0022yes\u0022,\u0022hwIsCurrentIssue\u0022:\u0022no\u0022,\u0022hwIsOpenIssue\u0022:\u0022no\u0022,\u0022hwHasFullText\u0022:\u0022yes\u0022,\u0022hwHasPDF\u0022:\u0022yes\u0022,\u0022hwParentTitle\u0022:\u0022American Journal of Neuroradiology: 20 (3)\u0022,\u0022hwElectronicPubDate\u0022:\u00221999-03-01\u0022,\u0022hwElectronicPubDateTime\u0022:\u00221999-03-01 00:00:00\u0022}}"},"highwire_panel_tabs":[{"panel_name":"jnl_ajnr_tab_pdf","panel_ajax_tab":"jnl_ajnr_tab_pdf"}],"panel_ajax_tab":{"path":"sites\/all\/modules\/contrib\/panels_ajax_tab"},"instances":"{\u0022highwire_abstract_tooltip\u0022:{\u0022content\u0022:{\u0022text\u0022:\u0022\u0022},\u0022style\u0022:{\u0022tip\u0022:{\u0022width\u0022:20,\u0022height\u0022:20,\u0022border\u0022:1,\u0022offset\u0022:0,\u0022corner\u0022:true},\u0022classes\u0022:\u0022qtip-custom hw-tooltip hw-abstract-tooltip qtip-shadow qtip-rounded\u0022,\u0022classes_custom\u0022:\u0022hw-tooltip hw-abstract-tooltip\u0022},\u0022position\u0022:{\u0022at\u0022:\u0022right center\u0022,\u0022my\u0022:\u0022left center\u0022,\u0022viewport\u0022:true,\u0022adjust\u0022:{\u0022method\u0022:\u0022shift\u0022}},\u0022show\u0022:{\u0022event\u0022:\u0022mouseenter click \u0022,\u0022solo\u0022:true},\u0022hide\u0022:{\u0022event\u0022:\u0022mouseleave \u0022,\u0022fixed\u0022:1,\u0022delay\u0022:\u0022100\u0022}},\u0022highwire_author_tooltip\u0022:{\u0022content\u0022:{\u0022text\u0022:\u0022\u0022},\u0022style\u0022:{\u0022tip\u0022:{\u0022width\u0022:15,\u0022height\u0022:15,\u0022border\u0022:1,\u0022offset\u0022:0,\u0022corner\u0022:true},\u0022classes\u0022:\u0022qtip-custom hw-tooltip hw-author-tooltip qtip-shadow qtip-rounded\u0022,\u0022classes_custom\u0022:\u0022hw-tooltip hw-author-tooltip\u0022},\u0022position\u0022:{\u0022at\u0022:\u0022top center\u0022,\u0022my\u0022:\u0022bottom center\u0022,\u0022viewport\u0022:true,\u0022adjust\u0022:{\u0022method\u0022:\u0022\u0022}},\u0022show\u0022:{\u0022event\u0022:\u0022mouseenter \u0022,\u0022solo\u0022:true},\u0022hide\u0022:{\u0022event\u0022:\u0022mouseleave \u0022,\u0022fixed\u0022:1,\u0022delay\u0022:\u0022100\u0022}},\u0022highwire_reflinks_tooltip\u0022:{\u0022content\u0022:{\u0022text\u0022:\u0022\u0022},\u0022style\u0022:{\u0022tip\u0022:{\u0022width\u0022:15,\u0022height\u0022:15,\u0022border\u0022:1,\u0022mimic\u0022:\u0022top center\u0022,\u0022offset\u0022:0,\u0022corner\u0022:true},\u0022classes\u0022:\u0022qtip-custom hw-tooltip hw-ref-link-tooltip qtip-shadow qtip-rounded\u0022,\u0022classes_custom\u0022:\u0022hw-tooltip hw-ref-link-tooltip\u0022},\u0022position\u0022:{\u0022at\u0022:\u0022bottom left\u0022,\u0022my\u0022:\u0022top left\u0022,\u0022viewport\u0022:true,\u0022adjust\u0022:{\u0022method\u0022:\u0022flip\u0022}},\u0022show\u0022:{\u0022event\u0022:\u0022mouseenter \u0022,\u0022solo\u0022:true},\u0022hide\u0022:{\u0022event\u0022:\u0022mouseleave \u0022,\u0022fixed\u0022:1,\u0022delay\u0022:\u0022100\u0022}}}","qtipDebug":"{\u0022leaveElement\u0022:0}","urlIsAjaxTrusted":{"\/content\/20\/3\/461.abstract":true},"ws_fl":{"width":100,"height":21},"ws_gpo":{"size":"","annotation":"","lang":"","callback":"","width":300},"highwire_search_similar_articles":{"highwire-search-similar-articles-list-1":{"conf":{"context":"requiredcontext_entity:node_1","override_title":1,"override_title_text":"\u003Ci class=\u0022icon-caret-right\u0022\u003E\u003C\/i\u003E Similar Articles","number_per_page":"5","show_pager":0,"more_link_path":"similar\/articles","more_link":1,"empty_message":"No similar articles are available.","citation_style":"jcore_standard","title_type":"prefer_short","title_as_link":0,"display_subtitle":0,"choose_pubdate":"ppubdate","display_markup_snippet":"","display_original_link":0,"display_access_indicator":0,"display_cme_link":0,"display_access_indicator_text":0,"display_highlight_image":"0","display_variants":0,"display_supplements":0,"display_abstract_tooltip":0,"display_author_tooltip":0,"override_title_heading":"h2","citation_settings_source":"citation_manager","citation_manager_wrapper":{"citation_manager_citation":"jcore_list_title_only"},"corpus_config_wrapper":{"corpus_config_citation_context":[]},"cache_enabled":1,"cache_time":"600","short_title_options":{"char_count":"50","add_ellipsis":0},"access_indicator_settings":{"open_access":{"icon":"icon-unlock","title":"Open Access"},"user_access":{"icon":"icon-ok-sign","title":"You have access"},"no_access":{"icon":"icon-lock","title":"Restricted access"}},"pdf_download":{"display_pdf_download":0,"pdf_download_icon":"icon-cloud-download","pdf_download_text":"PDF"},"include_on_behalf":1,"show_mark_citation":0,"display_infotrieve_link":0,"infotrieve_link_settings":{"icon":"icon-usd","link_caption":"Order full text via Infotrieve"},"highlight_image_style":"","featured_image_variant":"large","featured_image_click_image":"colorbox","display_google_scholar_tooltip":1,"display_pubmed_tooltip":1,"display_advanced_search_tooltip":1,"display_author_landing_page_tooltip":1,"display_orcid_tooltip":0,"display_ads_search_tooltip":0,"display_agricola_tooltip":0,"author_site_search_path":"","display_translations":0,"display_translations_text":"","display_translations_text_icon":"","bundle_overrides_checkboxes":{"highwire_book_fragment":{"selector":0},"highwire_news_story":{"selector":0},"highwire_book_edition":{"selector":0},"highwire_article":{"selector":0},"highwire_issue":{"selector":0},"highwire_comment":{"selector":0},"highwire_fragment":{"selector":0},"highwire_book_section":{"selector":0},"highwire_journal":{"selector":0}},"bundle_overrides":{"highwire_book_fragment":{"selector":0,"citation_style":"jcore_title_and_author","cache_enabled":1,"cache_time":"600","title_type":"full","short_title_options":{"char_count":"50","add_ellipsis":0},"title_as_link":0,"display_subtitle":0,"choose_pubdate":"ppubdate","display_markup_snippet":"","highlight_image_toggle":0,"display_original_link":0,"display_access_indicator":"0","access_indicator_settings":{"open_access":{"icon":"icon-unlock","title":"Open Access"},"user_access":{"icon":"icon-ok-sign","title":"You have access"},"no_access":{"icon":"icon-lock","title":"Restricted access"}},"display_variants":0,"display_supplements":0,"pdf_download":{"display_pdf_download":0,"pdf_download_icon":"icon-cloud-download","pdf_download_text":"PDF"},"include_on_behalf":1,"cpath_prefix":"\/content","show_mark_citation":0,"display_infotrieve_link":0,"infotrieve_link_settings":{"icon":"icon-usd","link_caption":"Order full text via Infotrieve"},"display_highlight_image":0,"highlight_image_style":"thumbnail","display_fragment_caption":1,"display_parent_citation":1,"parent_citation_type":"highwire_book_section","parent_citation_settings":{"citation_style":"folio_book_sections_standard","cache_enabled":1,"cache_time":"600","title_type":"full","short_title_options":{"char_count":"50","add_ellipsis":0},"title_as_link":0,"display_subtitle":0,"choose_pubdate":"ppubdate","display_markup_snippet":"","highlight_image_toggle":0,"display_original_link":0,"display_access_indicator":0,"access_indicator_settings":{"open_access":{"icon":"icon-unlock","title":"Open Access"},"user_access":{"icon":"icon-ok-sign","title":"You have access"},"no_access":{"icon":"icon-lock","title":"Restricted access"}},"display_variants":0,"display_supplements":0,"pdf_download":{"display_pdf_download":0,"pdf_download_icon":"icon-cloud-download","pdf_download_text":"PDF"},"include_on_behalf":1,"cpath_prefix":"\/content","show_mark_citation":0,"display_infotrieve_link":0,"infotrieve_link_settings":{"icon":"icon-usd","link_caption":"Order full text via Infotrieve"},"display_highlight_image":0,"highlight_image_style":"","display_abstract_tooltip":0,"display_author_tooltip":0,"display_google_scholar_tooltip":1,"display_pubmed_tooltip":1,"display_advanced_search_tooltip":1,"display_author_landing_page_tooltip":0,"author_site_search_path":"search\/"}},"highwire_news_story":{"selector":0,"citation_style":"mla","cache_enabled":1,"cache_time":"600","title_type":"full","short_title_options":{"char_count":"50","add_ellipsis":0},"title_as_link":0,"display_subtitle":0,"choose_pubdate":"ppubdate","display_markup_snippet":"","highlight_image_toggle":0,"display_original_link":0,"display_access_indicator":0,"access_indicator_settings":{"open_access":{"icon":"icon-unlock","title":"Open Access"},"user_access":{"icon":"icon-ok-sign","title":"You have access"},"no_access":{"icon":"icon-lock","title":"Restricted access"}},"display_variants":0,"display_supplements":0,"pdf_download":{"display_pdf_download":0,"pdf_download_icon":"icon-cloud-download","pdf_download_text":"PDF"},"include_on_behalf":1,"cpath_prefix":"\/content","show_mark_citation":0,"display_infotrieve_link":0,"infotrieve_link_settings":{"icon":"icon-usd","link_caption":"Order full text via Infotrieve"},"display_highlight_image":"0","highlight_image_style":"","featured_image_click_image":"nothing","display_author_tooltip":0,"display_google_scholar_tooltip":0,"display_pubmed_tooltip":0,"display_advanced_search_tooltip":0},"highwire_book_edition":{"selector":0,"citation_style":"folio_books_standard","cache_enabled":1,"cache_time":"600","title_type":"full","short_title_options":{"char_count":"50","add_ellipsis":0},"title_as_link":0,"display_subtitle":0,"choose_pubdate":"ppubdate","display_markup_snippet":"","highlight_image_toggle":0,"display_original_link":0,"display_access_indicator":0,"access_indicator_settings":{"open_access":{"icon":"icon-unlock","title":"Open Access"},"user_access":{"icon":"icon-ok-sign","title":"You have access"},"no_access":{"icon":"icon-lock","title":"Restricted access"}},"display_variants":0,"display_supplements":0,"pdf_download":{"display_pdf_download":0,"pdf_download_icon":"icon-cloud-download","pdf_download_text":"PDF"},"include_on_behalf":1,"cpath_prefix":"\/content","show_mark_citation":0,"display_infotrieve_link":0,"infotrieve_link_settings":{"icon":"icon-usd","link_caption":"Order full text via Infotrieve"},"display_highlight_image":0,"highlight_image_style":"","display_author_tooltip":0,"display_google_scholar_tooltip":1,"display_pubmed_tooltip":1,"display_advanced_search_tooltip":1,"display_author_landing_page_tooltip":1,"display_orcid_tooltip":1,"author_site_search_path":"search\/"},"highwire_article":{"selector":0,"citation_style":"mla","cache_enabled":1,"cache_time":"600","title_type":"full","short_title_options":{"char_count":"50","add_ellipsis":0},"title_as_link":0,"display_subtitle":0,"choose_pubdate":"ppubdate","display_markup_snippet":"","highlight_image_toggle":0,"display_original_link":0,"display_access_indicator":0,"access_indicator_settings":{"open_access":{"icon":"icon-unlock","title":"Open Access"},"user_access":{"icon":"icon-ok-sign","title":"You have access"},"no_access":{"icon":"icon-lock","title":"Restricted access"}},"display_variants":0,"display_supplements":0,"pdf_download":{"display_pdf_download":0,"pdf_download_icon":"icon-cloud-download","pdf_download_text":"PDF"},"include_on_behalf":0,"cpath_prefix":"\/content","show_mark_citation":0,"display_infotrieve_link":0,"infotrieve_link_settings":{"icon":"icon-usd","link_caption":"Order full text via Infotrieve"},"display_highlight_image":"0","highlight_image_style":"","featured_image_variant":"large","featured_image_click_image":"nothing","display_cme_link":0,"display_abstract_tooltip":0,"display_author_tooltip":0,"display_google_scholar_tooltip":1,"display_pubmed_tooltip":1,"display_advanced_search_tooltip":1,"display_author_landing_page_tooltip":1,"display_orcid_tooltip":1,"display_ads_search_tooltip":0,"display_agricola_tooltip":0,"author_site_search_path":"search\/","display_translations":0,"display_translations_text":"Translations Available","display_translations_text_icon":"icon-globe"},"highwire_issue":{"selector":0,"citation_style":"mla","cache_enabled":1,"cache_time":"600","title_type":"full","short_title_options":{"char_count":"50","add_ellipsis":0},"title_as_link":0,"display_subtitle":0,"choose_pubdate":"ppubdate","display_markup_snippet":"","highlight_image_toggle":0,"display_original_link":0,"display_access_indicator":0,"access_indicator_settings":{"open_access":{"icon":"icon-unlock","title":"Open Access"},"user_access":{"icon":"icon-ok-sign","title":"You have access"},"no_access":{"icon":"icon-lock","title":"Restricted access"}},"display_variants":0,"display_supplements":0,"pdf_download":{"display_pdf_download":0,"pdf_download_icon":"icon-cloud-download","pdf_download_text":"PDF"},"include_on_behalf":1,"cpath_prefix":"\/content","show_mark_citation":0,"display_infotrieve_link":0,"infotrieve_link_settings":{"icon":"icon-usd","link_caption":"Order full text via Infotrieve"},"display_highlight_image":0,"highlight_image_style":"","featured_image_click_image":"nothing","display_author_tooltip":0,"display_google_scholar_tooltip":1,"display_pubmed_tooltip":1,"display_advanced_search_tooltip":1,"display_author_landing_page_tooltip":0,"display_orcid_tooltip":1,"author_site_search_path":"search\/"},"highwire_comment":{"selector":0,"citation_style":"highwire_comment","show_title":0,"title_as_link":0,"title_as_link_type":"tab_view","author_format_type":"fullname","author_format_custom":"","author_list_separator":", ","date_format":"(j F Y)","display_comment_body":1,"display_attachment":1,"display_conflict_of_interest":1},"highwire_fragment":{"selector":0,"citation_style":"jcore_title_and_author","cache_enabled":1,"cache_time":"600","title_type":"full","short_title_options":{"char_count":"50","add_ellipsis":0},"title_as_link":0,"display_subtitle":0,"choose_pubdate":"ppubdate","display_markup_snippet":"","highlight_image_toggle":0,"display_original_link":0,"display_access_indicator":"0","access_indicator_settings":{"open_access":{"icon":"icon-unlock","title":"Open Access"},"user_access":{"icon":"icon-ok-sign","title":"You have access"},"no_access":{"icon":"icon-lock","title":"Restricted access"}},"display_variants":0,"display_supplements":0,"pdf_download":{"display_pdf_download":0,"pdf_download_icon":"icon-cloud-download","pdf_download_text":"PDF"},"include_on_behalf":1,"cpath_prefix":"\/content","show_mark_citation":0,"display_infotrieve_link":0,"infotrieve_link_settings":{"icon":"icon-usd","link_caption":"Order full text via Infotrieve"},"display_highlight_image":0,"highlight_image_style":"","display_fragment_caption":1,"fragment_image_settings":{"fragment_image_variant":"medium","fragment_click_image":"colorbox","show_download_links":1},"display_parent_citation":1,"parent_citation_type":"highwire_article","parent_citation_settings":{"citation_style":"mla","cache_enabled":1,"cache_time":"600","title_type":"full","short_title_options":{"char_count":"50","add_ellipsis":0},"title_as_link":0,"display_subtitle":0,"choose_pubdate":"ppubdate","display_markup_snippet":"","highlight_image_toggle":0,"display_original_link":0,"display_access_indicator":0,"access_indicator_settings":{"open_access":{"icon":"icon-unlock","title":"Open Access"},"user_access":{"icon":"icon-ok-sign","title":"You have access"},"no_access":{"icon":"icon-lock","title":"Restricted access"}},"display_variants":0,"display_supplements":0,"pdf_download":{"display_pdf_download":0,"pdf_download_icon":"icon-cloud-download","pdf_download_text":"PDF"},"include_on_behalf":0,"cpath_prefix":"\/content","show_mark_citation":0,"display_infotrieve_link":0,"infotrieve_link_settings":{"icon":"icon-usd","link_caption":"Order full text via Infotrieve"},"display_highlight_image":"0","highlight_image_style":"","featured_image_variant":"large","featured_image_click_image":"nothing","display_cme_link":0,"display_abstract_tooltip":0,"display_author_tooltip":0,"display_google_scholar_tooltip":1,"display_pubmed_tooltip":1,"display_advanced_search_tooltip":1,"display_author_landing_page_tooltip":1,"display_orcid_tooltip":1,"display_ads_search_tooltip":0,"display_agricola_tooltip":0,"author_site_search_path":"search\/","display_translations":0,"display_translations_text":"Translations Available","display_translations_text_icon":"icon-globe"}},"highwire_book_section":{"selector":0,"citation_style":"folio_book_sections_standard","cache_enabled":1,"cache_time":"600","title_type":"full","short_title_options":{"char_count":"50","add_ellipsis":0},"title_as_link":0,"display_subtitle":0,"choose_pubdate":"ppubdate","display_markup_snippet":"","highlight_image_toggle":0,"display_original_link":0,"display_access_indicator":0,"access_indicator_settings":{"open_access":{"icon":"icon-unlock","title":"Open Access"},"user_access":{"icon":"icon-ok-sign","title":"You have access"},"no_access":{"icon":"icon-lock","title":"Restricted access"}},"display_variants":0,"display_supplements":0,"pdf_download":{"display_pdf_download":0,"pdf_download_icon":"icon-cloud-download","pdf_download_text":"PDF"},"include_on_behalf":1,"cpath_prefix":"\/content","show_mark_citation":0,"display_infotrieve_link":0,"infotrieve_link_settings":{"icon":"icon-usd","link_caption":"Order full text via Infotrieve"},"display_highlight_image":0,"highlight_image_style":"","display_abstract_tooltip":0,"display_author_tooltip":0,"display_google_scholar_tooltip":1,"display_pubmed_tooltip":1,"display_advanced_search_tooltip":1,"display_author_landing_page_tooltip":0,"author_site_search_path":"search\/"},"highwire_journal":{"selector":0,"citation_style":"mla","cache_enabled":1,"cache_time":"600","title_type":"full","short_title_options":{"char_count":"50","add_ellipsis":0},"title_as_link":0,"display_subtitle":0,"choose_pubdate":"ppubdate","display_markup_snippet":"","highlight_image_toggle":0,"display_original_link":0,"display_access_indicator":0,"access_indicator_settings":{"open_access":{"icon":"icon-unlock","title":"Open Access"},"user_access":{"icon":"icon-ok-sign","title":"You have access"},"no_access":{"icon":"icon-lock","title":"Restricted access"}},"display_variants":0,"display_supplements":0,"pdf_download":{"display_pdf_download":0,"pdf_download_icon":"icon-cloud-download","pdf_download_text":"PDF"},"include_on_behalf":1,"cpath_prefix":"\/content","show_mark_citation":0,"display_infotrieve_link":0,"infotrieve_link_settings":{"icon":"icon-usd","link_caption":"Order full text via Infotrieve"},"display_highlight_image":0,"highlight_image_style":"","display_author_tooltip":0,"display_google_scholar_tooltip":1,"display_pubmed_tooltip":1,"display_advanced_search_tooltip":1,"display_author_landing_page_tooltip":0,"display_orcid_tooltip":1,"author_site_search_path":"search\/"}},"cpath_prefix":"\/content","ajax_loading_icon_classes":"icon-spinner icon-spin icon-2x","ajax_loading_text":"","highlight_image_toggle":0,"more_link_label":"See more","url_parameters":{"q":"node\/11219","variant":"abstract"}},"nid":"11219"}},"panels_accordion":{"highwire_article_accordion_container":{"heightStyle":"content","autoHeight":false,"collapsible":0,"region_accordion_id":"highwire_article_accordion_container","active":0,"animated":"slide"}},"color":{"logo":"http:\/\/ajnr-stage2.stage.highwire.org\/sites\/default\/files\/ajnr-web-logo_0.png"},"nice_menus_options":{"delay":800,"speed":"fast"},"highwireResponsive":{"enquire_enabled":1,"breakpoints_configured":1,"breakpoints":{"zero":"all and (min-width: 0px)","xsmall":"all and (min-width: 380px)","narrow":"all and (min-width: 768px) and (min-device-width: 768px), (max-device-width: 800px) and (min-width: 768px) and (orientation:landscape)","normal":"all and (min-width: 980px) and (min-device-width: 980px), all and (max-device-width: 1024px) and (min-width: 1024px) and (orientation:landscape)","wide":"all and (min-width: 1220px)"}},"eu_cookie_compliance":{"popup_enabled":1,"popup_agreed_enabled":0,"popup_hide_agreed":false,"popup_clicking_confirmation":true,"popup_scrolling_confirmation":false,"popup_html_info":"\u003Cdiv\u003E\n  \u003Cdiv class=\u0022popup-content info\u0022\u003E\n    \u003Cdiv id=\u0022popup-text\u0022\u003E\n      \u003Cp\u003EWe use cookies on this site to enhance your user experience. By clicking any link on this page you are giving your consent for us to set cookies.\u003C\/p\u003E\n    \u003C\/div\u003E\n    \u003Cdiv id=\u0022popup-buttons\u0022\u003E\n      \u003Cbutton type=\u0022button\u0022 role=\u0022dialog\u0022 aria-labelledby=\u0022Continue\u0022\n        class=\u0022agree-button eu-cookie-compliance-default-button\u0022\u003EContinue\u003C\/button\u003E\n                  \u003Cbutton type=\u0022button\u0022 role=\u0022dialog\u0022 aria-labelledby=\u0022Find out more\u0022\n        class=\u0022find-more-button eu-cookie-compliance-more-button\u0022\u003EFind out more\u003C\/button\u003E\n          \u003C\/div\u003E\n  \u003C\/div\u003E\n\u003C\/div\u003E","use_mobile_message":false,"mobile_popup_html_info":"\u003Cdiv\u003E\n  \u003Cdiv class=\u0022popup-content info\u0022\u003E\n    \u003Cdiv id=\u0022popup-text\u0022\u003E\n          \u003C\/div\u003E\n    \u003Cdiv id=\u0022popup-buttons\u0022\u003E\n      \u003Cbutton type=\u0022button\u0022 role=\u0022dialog\u0022 aria-labelledby=\u0022Continue\u0022\n        class=\u0022agree-button eu-cookie-compliance-default-button\u0022\u003EContinue\u003C\/button\u003E\n                  \u003Cbutton type=\u0022button\u0022 role=\u0022dialog\u0022 aria-labelledby=\u0022Find out more\u0022\n        class=\u0022find-more-button eu-cookie-compliance-more-button\u0022\u003EFind out more\u003C\/button\u003E\n          \u003C\/div\u003E\n  \u003C\/div\u003E\n\u003C\/div\u003E","mobile_breakpoint":"768","popup_html_agreed":"\u003Cdiv\u003E\n  \u003Cdiv class=\u0022popup-content agreed\u0022\u003E\n    \u003Cdiv id=\u0022popup-text\u0022\u003E\n      \u003Cp\u003EThank you for accepting cookies. You can now hide this message or find out more about cookies.\u003C\/p\u003E\n    \u003C\/div\u003E\n    \u003Cdiv id=\u0022popup-buttons\u0022\u003E\n      \u003Cbutton type=\u0022button\u0022 class=\u0022hide-popup-button eu-cookie-compliance-hide-button\u0022\u003EHide\u003C\/button\u003E\n              \u003Cbutton type=\u0022button\u0022 class=\u0022find-more-button eu-cookie-compliance-more-button-thank-you\u0022 \u003EFind out more\u003C\/button\u003E\n          \u003C\/div\u003E\n  \u003C\/div\u003E\n\u003C\/div\u003E","popup_use_bare_css":false,"popup_height":"auto","popup_width":"100%","popup_delay":1000,"popup_link":"\/help\/cookie-policy","popup_link_new_window":1,"popup_position":null,"popup_language":"en","store_consent":false,"better_support_for_screen_readers":0,"reload_page":0,"domain":"","popup_eu_only_js":0,"cookie_lifetime":365,"cookie_session":false,"disagree_do_not_show_popup":0,"method":"default","whitelisted_cookies":"","withdraw_markup":"\u003Cbutton type=\u0022button\u0022 class=\u0022eu-cookie-withdraw-tab\u0022\u003EPrivacy settings\u003C\/button\u003E\n\u003Cdiv class=\u0022eu-cookie-withdraw-banner\u0022\u003E\n  \u003Cdiv class=\u0022popup-content info\u0022\u003E\n    \u003Cdiv id=\u0022popup-text\u0022\u003E\n      \u003Cp\u003E\u0026lt;h2\u0026gt;We use cookies on this site to enhance your user experience\u0026lt;\/h2\u0026gt;\u0026lt;p\u0026gt;You have given your consent for us to set cookies.\u0026lt;\/p\u0026gt;\u003C\/p\u003E\n    \u003C\/div\u003E\n    \u003Cdiv id=\u0022popup-buttons\u0022\u003E\n      \u003Cbutton type=\u0022button\u0022 class=\u0022eu-cookie-withdraw-button\u0022\u003EWithdraw consent\u003C\/button\u003E\n    \u003C\/div\u003E\n  \u003C\/div\u003E\n\u003C\/div\u003E\n","withdraw_enabled":false},"googleanalytics":{"account":["G-4CRTLTY8KW"],"trackOutbound":1,"trackMailto":1,"trackDownload":1,"trackDownloadExtensions":"7z|aac|arc|arj|asf|asx|avi|bin|csv|doc(x|m)?|dot(x|m)?|exe|flv|gif|gz|gzip|hqx|jar|jpe?g|js|mp(2|3|4|e?g)|mov(ie)?|msi|msp|pdf|phps|png|ppt(x|m)?|pot(x|m)?|pps(x|m)?|ppam|sld(x|m)?|thmx|qtm?|ra(m|r)?|sea|sit|tar|tgz|torrent|txt|wav|wma|wmv|wpd|xls(x|m|b)?|xlt(x|m)|xlam|xml|z|zip","trackColorbox":1},"omega":{"layouts":{"primary":"normal","order":["narrow","normal","wide"],"queries":{"narrow":"all and (min-width: 768px) and (min-device-width: 768px), (max-device-width: 800px) and (min-width: 768px) and (orientation:landscape)","normal":"all and (min-width: 980px) and (min-device-width: 980px), all and (max-device-width: 1024px) and (min-width: 1024px) and (orientation:landscape)","wide":"all and (min-width: 1220px)"}}}});
//--><!]]>
</script>
    <!--[if lt IE 9]><script src="http://html5shiv.googlecode.com/svn/trunk/html5.js"></script><![endif]-->
  </head>
  <body class="html not-front not-logged-in page-node page-node- page-node-11219 node-type-highwire-article context-content hw-default-jcode-ajnr hw-article-type-research-article hw-article-category-head-and-neck">
<!-- Google Tag Manager -->
<noscript><iframe src="//www.googletagmanager.com/ns.html?id=GTM-MXP45WNH" height="0" width="0" style="display:none;visibility:hidden"></iframe></noscript>
<script type="text/javascript">(function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0];var j=d.createElement(s);var dl=l!='dataLayer'?'&l='+l:'';j.src='//www.googletagmanager.com/gtm.js?id='+i+dl;j.type='text/javascript';j.async=true;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-MXP45WNH');</script>
<!-- End Google Tag Manager -->
    <div id="skip-link">
      <a href="#main-content" class="element-invisible element-focusable">Skip to main content</a>
    </div>
    <div class="region region-page-top" id="region-page-top">
  <div class="region-inner region-page-top-inner">
      </div>
</div>    <div class="page clearfix footer-borders panels-page panels-layout-jcore_2col" id="page">
      <header id="section-header" class="section section-header">
  <div id="zone-advertising-top-wrapper" class="zone-wrapper zone-advertising-top-wrapper clearfix">  
  <div id="zone-advertising-top" class="zone zone-advertising-top clearfix container-30">
    <div class="grid-28 suffix-1 prefix-1 region region-ad-top" id="region-ad-top">
  <div class="region-inner region-ad-top-inner">
    <div class="block block-panels-mini mobile-hiddens rtecenter block-jnl-ajnr-ad-leaderboard block-panels-mini-jnl-ajnr-ad-leaderboard odd block-without-title" id="block-panels-mini-jnl-ajnr-ad-leaderboard">
  <div class="block-inner clearfix">
                
    <div class="content clearfix">
      <div class="panel-display panel-1col clearfix" id="mini-panel-jnl_ajnr_ad_leaderboard">
  <div class="panel-panel panel-col">
    <div><div class="panel-pane pane-dfp-pane text-center" >
  
      
  
  <div class="pane-content">
    <div id="dfp-ad-top_leaderboard-wrapper" class="dfp-tag-wrapper">
<div class="slug">Advertisement</div>
<div  id="dfp-ad-top_leaderboard" class="dfp-tag-wrapper">
  <script type="text/javascript">
    googletag.cmd.push(function() {
      googletag.display("dfp-ad-top_leaderboard");
    });
  </script>
</div>
</div>  </div>

  
  </div>
</div>
  </div>
</div>
    </div>
  </div>
</div>  </div>
</div>  </div>
</div><div id="zone-superheader-wrapper" class="zone-wrapper zone-superheader-wrapper clearfix mobile-only print-hidden">  
  <div id="zone-superheader" class="zone zone-superheader clearfix mobile-only print-hidden container-30">
    <div class="grid-30 region region-superheader" id="region-superheader">
  <div class="region-inner region-superheader-inner">
    <div class="block block-panels-mini block-responsive-menu block-panels-mini-responsive-menu odd block-without-title" id="block-panels-mini-responsive-menu">
  <div class="block-inner clearfix">
                
    <div class="content clearfix">
      <div class="panel-display panel-1col clearfix" id="mini-panel-responsive_menu">
  <div class="panel-panel panel-col">
    <div><div id="unique-id3" class="highwire-responsive-toggle-group"><div class="panel-pane pane-panels-mini pane-responsive-menu-main-menu" >
  
        <h2 class="pane-title"><span class="icon-reorder"></span><span class="element-invisible">Main menu</span></h2>
    
  
  <div class="pane-content">
    <div class="panel-display panel-1col clearfix" id="mini-panel-responsive_menu_main_menu">
  <div class="panel-panel panel-col">
    <div><div class="panel-pane pane-menu-tree pane-main-menu" >
  
      
  
  <div class="pane-content">
    <div class="menu-block-wrapper menu-block-ctools-main-menu-1 menu-name-main-menu parent-mlid-main-menu:0 menu-level-1">
  <nav class="menubar-nav"><ul class="menu" role="menu"><li class="first leaf menu-mlid-772" role="menuitem"><a href="/" class="" data-icon-position="" data-hide-link-title="0">Home</a></li>
<li class="expanded active-trail menu-mlid-773" role="menuitem"><a href="/content/current" data-hide-link-title="0" class="active active-trail" data-icon-position="">Content</a><nav class="menubar-nav"><ul class="menu" role="menu"><li class="first expanded menu-mlid-774" role="menuitem"><a href="/content/current" data-hide-link-title="0" class="" data-icon-position="">Current Issue</a></li>
<li class="leaf menu-mlid-1747" role="menuitem"><a href="/content/early/preprint" data-hide-link-title="0" class="" data-icon-position="">Publication Preview--Preprint</a></li>
<li class="leaf menu-mlid-775" role="menuitem"><a href="/content/early/recent" data-hide-link-title="0" class="" data-icon-position="">Publication Preview--Ahead of Print</a></li>
<li class="leaf menu-mlid-776" role="menuitem"><a href="/content/by/year" data-hide-link-title="0" class="" data-icon-position="">Past Issue Archive</a></li>
<li class="leaf menu-mlid-900" role="menuitem"><a href="/cow/by/year" data-hide-link-title="0" class="" data-icon-position="">Case of the Week Archive</a></li>
<li class="leaf menu-mlid-1006" role="menuitem"><a href="/cc/by/year" data-hide-link-title="0" class="" data-icon-position="">Classic Case Archive</a></li>
<li class="leaf menu-mlid-901" role="menuitem"><a href="/com/by/year" data-hide-link-title="0" class="" data-icon-position="">Case of the Month Archive</a></li>
<li class="last leaf menu-mlid-1334" role="menuitem"><a href="http://www.ajnr.org/content/covid-19-content-and-resources" data-hide-link-title="0" class="" data-icon-position="">COVID-19 Content and Resources</a></li>
</ul></nav></li>
<li class="expanded menu-mlid-784" role="menuitem"><a href="/content/about-us" class="" data-icon-position="" data-hide-link-title="0">About Us</a><nav class="menubar-nav"><ul class="menu" role="menu"><li class="first leaf menu-mlid-785" role="menuitem"><a href="/page/content/About" data-hide-link-title="0" class="" data-icon-position="">About AJNR</a></li>
<li class="leaf menu-mlid-899" role="menuitem"><a href="https://www.ajnr.org/page/content/Ed-Board" data-hide-link-title="0" class="" data-icon-position="">Editorial Board</a></li>
<li class="last leaf menu-mlid-864" role="menuitem"><a href="http://www.asnr.org" data-hide-link-title="0" target="_blank" class="" data-icon-position="">American Society of Neuroradiology</a></li>
</ul></nav></li>
<li class="expanded menu-mlid-1746" role="menuitem"><a href="/" class="" data-icon-position="" data-hide-link-title="0">For Authors</a><nav class="menubar-nav"><ul class="menu" role="menu"><li class="first leaf menu-mlid-1725" role="menuitem"><a href="https://www.ajnr.org/content/author-policies" data-hide-link-title="0" class="" data-icon-position="">Author Policies</a></li>
<li class="leaf menu-mlid-1856" role="menuitem"><a href="https://www.ajnr.org/preprint_publishing" data-hide-link-title="0" class="" data-icon-position="">Preprint Publishing</a></li>
<li class="last leaf menu-mlid-1726" role="menuitem"><a href="https://www.ajnr.org/content/manuscript-submission-guidelines" data-hide-link-title="0" class="" data-icon-position="">Manuscript Submission Guidelines</a></li>
</ul></nav></li>
<li class="leaf menu-mlid-862" role="menuitem"><a href="https://mc.manuscriptcentral.com/ajnr" data-hide-link-title="0" target="_blank" class="" data-icon-position="">Submit a Manuscript</a></li>
<li class="expanded menu-mlid-1184" role="menuitem"><a href="/content/about-us" data-hide-link-title="0" class="" data-icon-position="">Special Collections</a><nav class="menubar-nav"><ul class="menu" role="menu"><li class="first leaf menu-mlid-1733" role="menuitem"><a href="http://www.ajnr.org/cc/CSF-Spinal-Leak" data-hide-link-title="0" class="" data-icon-position="">Spinal CSF Leak Articles (Jan 2020-June 2024)</a></li>
<li class="leaf menu-mlid-1185" role="menuitem"><a href="http://www.ajnr.org/cc/most-impactful-ajnr-articles" data-hide-link-title="0" class="" data-icon-position="">Most Impactful AJNR Articles</a></li>
<li class="last leaf menu-mlid-1896" role="menuitem"><a href="http://www.ajnr.org/cc/2024-Awards" data-hide-link-title="0" class="" data-icon-position="">2024 AJNR Journal Awards</a></li>
</ul></nav></li>
<li class="last expanded menu-mlid-788" role="menuitem"><a href="/content/advertising" class="" data-icon-position="" data-hide-link-title="0">More</a><nav class="menubar-nav"><ul class="menu" role="menu"><li class="first leaf menu-mlid-780" role="menuitem"><a href="/content/subscriber-help-and-services" data-hide-link-title="0" class="" data-icon-position="">Subscribers</a></li>
<li class="leaf menu-mlid-863" role="menuitem"><a href="https://marketplace.copyright.com/rs-ui-web/mp/details/journal/122810747" data-hide-link-title="0" class="" data-icon-position="">Permissions</a></li>
<li class="leaf menu-mlid-782" role="menuitem"><a href="/page/content/Ads" data-hide-link-title="0" class="" data-icon-position="">Advertisers</a></li>
<li class="leaf menu-mlid-790" role="menuitem"><a href="/alerts" data-hide-link-title="0" class="" data-icon-position="">Alerts</a></li>
<li class="last leaf menu-mlid-791" role="menuitem"><a href="/feedback" class="" data-icon-position="" data-hide-link-title="0">Feedback</a></li>
</ul></nav></li>
</ul></nav></div>
  </div>

  
  </div>
</div>
  </div>
</div>
  </div>

  
  </div>
<div class="panel-pane pane-panels-mini pane-responsive-menu-user-menu" >
  
        <h2 class="pane-title"><span class="icon-gear"></span><span class="element-invisible">User menu</span></h2>
    
  
  <div class="pane-content">
    <div class="panel-display panel-1col clearfix" id="mini-panel-responsive_menu_user_menu">
  <div class="panel-panel panel-col">
    <div><div class="panel-pane pane-menu-tree pane-user-menu" >
  
      
  
  <div class="pane-content">
    <div class="menu-block-wrapper menu-block-ctools-user-menu-1 menu-name-user-menu parent-mlid-user-menu:0 menu-level-1">
  <nav class="menubar-nav"><ul class="menu" role="menu"><li class="first leaf menu-mlid-801" role="menuitem"><a href="/content/subscriber-help-and-services" data-hide-link-title="0" class="" data-icon-position="">Subscribe</a></li>
<li class="leaf menu-mlid-802" role="menuitem"><a href="/alerts" data-hide-link-title="0" class="" data-icon-position="">Alerts</a></li>
<li class="leaf menu-mlid-803" role="menuitem"><a href="/user/login?destination=/content/20/3/461%3Fvariant%3Dabstract" class="" data-icon-position="" data-hide-link-title="0">Log in</a></li>
<li class="last leaf menu-mlid-17" role="menuitem"><a href="/user/logout?current=node/11219" class="" data-icon-position="" data-hide-link-title="0">Log out</a></li>
</ul></nav></div>
  </div>

  
  </div>
<div class="panel-separator"></div><div class="panel-pane pane-highwire-user-identities" >
  
      
  
  <div class="pane-content">
    <div class="highwire-user-message" data-separator="|"><span class="highwire-user-institution" data-id-type="institution" data-identity="a%3A2%3A%7Bs%3A4%3A%22show%22%3Bi%3A1%3Bs%3A7%3A%22message%22%3Bs%3A50%3A%22Institution%3A%20%5Bidentity%3Ainstitutional_display_name%5D%22%3B%7D"></span></div>  </div>

  
  </div>
</div>
  </div>
</div>
  </div>

  
  </div>
<div class="panel-pane pane-panels-mini pane-responsive-menu-search" >
  
        <h2 class="pane-title"><span class="icon-search"></span><span class="element-invisible">Search</span></h2>
    
  
  <div class="pane-content">
    <div class="panel-display panel-1col clearfix" id="mini-panel-responsive_menu_search">
  <div class="panel-panel panel-col">
    <div><div class="panel-pane pane-highwire-seach-qsearch-nocontext" >
  
      
  
  <div class="pane-content">
    <form class="highwire-quicksearch button-style-mini button-style-mini" action="/content/20/3/461.abstract" method="post" id="highwire-search-qsearch-nocontext-form" accept-charset="UTF-8"><div><div class="form-item form-item-label-invisible form-type-textfield form-item-keywords">
  <label class="element-invisible" for="quick_search_header_keywords_208623369">Search for this keyword </label>
 <input placeholder="Search..." type="text" id="quick_search_header_keywords_208623369" name="keywords" value="" size="60" maxlength="128" class="form-text" />
</div>
<div class="button-wrapper button-mini"><span class="icon-search"></span><input data-icon-only="1" data-font-icon="icon-search" data-icon-position="after" type="submit" id="quick_search_header_submit_1913899755" name="op" value="Search" class="form-submit" /></div><input type="hidden" name="form_build_id" value="form-HyS8PkR8esaY3M1VFMq9e-smQUcYV0Ctl30O2V7dfA0" />
<input type="hidden" name="form_id" value="highwire_search_qsearch_nocontext_form" />
</div></form>  </div>

  
  </div>
<div class="panel-separator"></div><div class="panel-pane pane-custom pane-1 highwire-responsive-advanced-search-link pane-menu-tree" >
  
      
  
  <div class="pane-content">
    <ul class="menu">
  <li><a href="/search" title="Advanced search">Advanced search</a></li>
  </ul>  </div>

  
  </div>
</div>
  </div>
</div>
  </div>

  
  </div>
</div></div>
  </div>
</div>
    </div>
  </div>
</div><div class="block block-panels-mini block-hw-small-logo block-panels-mini-hw-small-logo even block-without-title" id="block-panels-mini-hw-small-logo">
  <div class="block-inner clearfix">
                
    <div class="content clearfix">
      <div class="panel-display panel-1col clearfix" id="mini-panel-hw_small_logo">
  <div class="panel-panel panel-col">
    <div><div class="panel-pane pane-small-logo" >
  
      
  
  <div class="pane-content">
    <a href="/" class="" data-icon-position="" data-hide-link-title="0"><img src="http://ajnr-stage2.stage.highwire.org/sites/default/files/ajnr-logo.png" alt="American Journal of Neuroradiology" title="American Journal of Neuroradiology" /></a>  </div>

  
  </div>
</div>
  </div>
</div>
    </div>
  </div>
</div>  </div>
</div>  </div>
</div><div id="zone-user-wrapper" class="zone-wrapper zone-user-wrapper clearfix mobile-hidden print-hidden">  
  <div id="zone-user" class="zone zone-user clearfix equal-height-container mobile-hidden print-hidden container-30">    
  	    <div class="grid-30 region region-user-second equal-height-element" id="region-user-second">
  <div class="region-inner region-user-second-inner">
    <div class="block block-panels-mini text-right no-margin-bottom block-jnl-ajnr-uid-strng block-panels-mini-jnl-ajnr-uid-strng odd block-without-title" id="block-panels-mini-jnl-ajnr-uid-strng">
  <div class="block-inner clearfix">
                
    <div class="content clearfix">
      <div class="panel-display panel-1col clearfix" id="mini-panel-jnl_ajnr_uid_strng">
  <div class="panel-panel panel-col">
    <div><div class="panel-pane pane-highwire-user-identities" >
  
      
  
  <div class="pane-content">
    <div class="highwire-user-message" data-separator=" | "><span class="highwire-user-institution" data-id-type="institution" data-identity="a%3A2%3A%7Bs%3A4%3A%22show%22%3Bi%3A1%3Bs%3A7%3A%22message%22%3Bs%3A85%3A%22%3Cspan%20class%3D%22narrow-hidden%22%3EInstitution%3A%20%3C%2Fspan%3E%5Bidentity%3Ainstitutional_display_name%5D%22%3B%7D"></span></div>  </div>

  
  </div>
</div>
  </div>
</div>
    </div>
  </div>
</div>  </div>
</div>  </div>
</div>  
  <div id="zone-branding" class="zone zone-branding clearfix mobile-hidden print-display-block container-30">
    <div class="grid-19 prefix-1 region region-branding print-display-block" id="region-branding">
  <div class="region-inner region-branding-inner">
        <div class="branding-data clearfix">
            <div class="logo-img">
        <a href="/" rel="home" class="" data-icon-position="" data-hide-link-title="0"><img alt="American Journal of Neuroradiology" src="http://ajnr-stage2.stage.highwire.org/sites/default/files/ajnr-web-logo_0.png" /></a>      </div>
                        <hgroup class="site-name-slogan element-invisible">        
                                <h2 class="site-name element-invisible"><a href="/" title="Home" class="" data-icon-position="" data-hide-link-title="0">American Journal of Neuroradiology</a></h2>
                              </hgroup>
          </div>
          </div>
</div><div class="grid-9 suffix-1 region region-branding-second print-hidden" id="region-branding-second">
  <div class="region-inner region-branding-second-inner">
    <div class="block block-panels-mini text-right no-margin-bottom block-jnl-ajnr-user-menu block-panels-mini-jnl-ajnr-user-menu odd block-without-title" id="block-panels-mini-jnl-ajnr-user-menu">
  <div class="block-inner clearfix">
                
    <div class="content clearfix">
      <div class="panel-display panel-1col clearfix" id="mini-panel-jnl_ajnr_user_menu">
  <div class="panel-panel panel-col">
    <div><div class="panel-pane pane-block pane-system-user-menu links inline pane-system" >
  
      
  
  <div class="pane-content">
    <nav class="menubar-nav"><ul class="menu" role="menu"><li class="first leaf" role="menuitem"><a href="/content/subscriber-help-and-services" data-hide-link-title="0" class="" data-icon-position="">Subscribe</a></li>
<li class="leaf" role="menuitem"><a href="/alerts" data-hide-link-title="0" class="" data-icon-position="">Alerts</a></li>
<li class="leaf" role="menuitem"><a href="/user/login?destination=/content/20/3/461%3Fvariant%3Dabstract" class="" data-icon-position="" data-hide-link-title="0">Log in</a></li>
<li class="last leaf" role="menuitem"><a href="/user/logout?current=node/11219" class="" data-icon-position="" data-hide-link-title="0">Log out</a></li>
</ul></nav>  </div>

  
  </div>
</div>
  </div>
</div>
    </div>
  </div>
</div><div class="block block-panels-mini block-jnl-ajnr-search-box block-panels-mini-jnl-ajnr-search-box even block-without-title" id="block-panels-mini-jnl-ajnr-search-box">
  <div class="block-inner clearfix">
                
    <div class="content clearfix">
      <div class="panel-display panel-1col clearfix" id="mini-panel-jnl_ajnr_search_box">
  <div class="panel-panel panel-col">
    <div><div class="panel-pane pane-highwire-seach-quicksearch no-margin-bottom" >
  
      
  
  <div class="pane-content">
    <form class="highwire-quicksearch button-style-mini button-style-mini" action="/content/20/3/461.abstract" method="post" id="highwire-search-quicksearch-form-0" accept-charset="UTF-8"><div><div class="form-item form-item-label-invisible form-type-textfield form-item-keywords">
  <label class="element-invisible" for="search_rightsidebar_keywords_750464193">Search for this keyword </label>
 <input placeholder="search" type="text" id="search_rightsidebar_keywords_750464193" name="keywords" value="" size="60" maxlength="128" class="form-text" />
</div>
<div class="button-wrapper button-mini"><span class="icon-search"></span><input data-icon-only="1" data-font-icon="icon-search" data-icon-position="after" type="submit" id="search_rightsidebar_submit_1454584620" name="op" value="Search" class="form-submit" /></div><input type="hidden" name="form_build_id" value="form-6GsEtN0F6UtTr4xji4U9XRs_WDUqQ79tsg3P7JbpYQY" />
<input type="hidden" name="form_id" value="highwire_search_quicksearch_form_0" />
</div></form>  </div>

  
  </div>
<div class="panel-separator"></div><div class="panel-pane pane-custom pane-2" >
  
      
  
  <div class="pane-content">
    <p><a href="/search">Advanced Search</a></p>  </div>

  
  </div>
</div>
  </div>
</div>
    </div>
  </div>
</div>  </div>
</div>  </div>
  
  <div id="zone-menu" class="zone zone-menu clearfix mobile-hidden container-30">
    <div class="grid-28 suffix-1 prefix-1 region region-menu region-menu-bg-opaque region-menu-no-border" id="region-menu">
  <div class="region-inner region-menu-inner">
        <div class="block block-nice-menus block-1 block-nice-menus-1 odd block-without-title" id="block-nice-menus-1">
  <div class="block-inner clearfix">
                
    <div class="content clearfix">
      <nav class="menubar-nav"><ul class="nice-menu nice-menu-down nice-menu-main-menu" id="nice-menu-1" role="menu"><li class="menu-772 menu-path-front first odd " role="menuitem"><a href="/" class="" data-icon-position="" data-hide-link-title="0">Home</a></li>
<li class="menu-773 menuparent  menu-path-content-current active-trail  even " role="menuitem"><a href="/content/current" data-hide-link-title="0" class="active" data-icon-position="">Content</a><ul role="menu"><li class="menu-774 menu-path-content-current first odd " role="menuitem"><a href="/content/current" data-hide-link-title="0" class="" data-icon-position="">Current Issue</a></li>
<li class="menu-1747 menu-path-content-early-preprint  even " role="menuitem"><a href="/content/early/preprint" data-hide-link-title="0" class="" data-icon-position="">Publication Preview--Preprint</a></li>
<li class="menu-775 menu-path-content-early-recent  odd " role="menuitem"><a href="/content/early/recent" data-hide-link-title="0" class="" data-icon-position="">Publication Preview--Ahead of Print</a></li>
<li class="menu-776 menu-path-content-by-year  even " role="menuitem"><a href="/content/by/year" data-hide-link-title="0" class="" data-icon-position="">Past Issue Archive</a></li>
<li class="menu-900 menu-path-cow-by-year  odd " role="menuitem"><a href="/cow/by/year" data-hide-link-title="0" class="" data-icon-position="">Case of the Week Archive</a></li>
<li class="menu-1006 menu-path-cc-by-year  even " role="menuitem"><a href="/cc/by/year" data-hide-link-title="0" class="" data-icon-position="">Classic Case Archive</a></li>
<li class="menu-901 menu-path-com-by-year  odd " role="menuitem"><a href="/com/by/year" data-hide-link-title="0" class="" data-icon-position="">Case of the Month Archive</a></li>
<li class="menu-1334 menu-path-ajnrorg-content-covid-19-content-and-resources  even last" role="menuitem"><a href="http://www.ajnr.org/content/covid-19-content-and-resources" data-hide-link-title="0" class="" data-icon-position="">COVID-19 Content and Resources</a></li>
</ul></li>
<li class="menu-784 menuparent  menu-path-node-7  odd " role="menuitem"><a href="/content/about-us" class="" data-icon-position="" data-hide-link-title="0">About Us</a><ul role="menu"><li class="menu-785 menu-path-node-935 first odd " role="menuitem"><a href="/page/content/About" data-hide-link-title="0" class="" data-icon-position="">About AJNR</a></li>
<li class="menu-899 menu-path-sajnrorg-page-content-ed-board  even " role="menuitem"><a href="https://www.ajnr.org/page/content/Ed-Board" data-hide-link-title="0" class="" data-icon-position="">Editorial Board</a></li>
<li class="menu-864 menu-path-asnrorg  odd last" role="menuitem"><a href="http://www.asnr.org" data-hide-link-title="0" target="_blank" class="" data-icon-position="">American Society of Neuroradiology</a></li>
</ul></li>
<li class="menu-1746 menuparent  menu-path-front  even " role="menuitem"><a href="/" class="" data-icon-position="" data-hide-link-title="0">For Authors</a><ul role="menu"><li class="menu-1725 menu-path-sajnrorg-content-author-policies first odd " role="menuitem"><a href="https://www.ajnr.org/content/author-policies" data-hide-link-title="0" class="" data-icon-position="">Author Policies</a></li>
<li class="menu-1856 menu-path-sajnrorg-preprint-publishing  even " role="menuitem"><a href="https://www.ajnr.org/preprint_publishing" data-hide-link-title="0" class="" data-icon-position="">Preprint Publishing</a></li>
<li class="menu-1726 menu-path-sajnrorg-content-manuscript-submission-guidelines  odd last" role="menuitem"><a href="https://www.ajnr.org/content/manuscript-submission-guidelines" data-hide-link-title="0" class="" data-icon-position="">Manuscript Submission Guidelines</a></li>
</ul></li>
<li class="menu-862 menu-path-smcmanuscriptcentralcom-ajnr  odd " role="menuitem"><a href="https://mc.manuscriptcentral.com/ajnr" data-hide-link-title="0" target="_blank" class="" data-icon-position="">Submit a Manuscript</a></li>
<li class="menu-1184 menuparent  menu-path-node-7  even " role="menuitem"><a href="/content/about-us" data-hide-link-title="0" class="" data-icon-position="">Special Collections</a><ul role="menu"><li class="menu-1733 menu-path-ajnrorg-cc-csf-spinal-leak first odd " role="menuitem"><a href="http://www.ajnr.org/cc/CSF-Spinal-Leak" data-hide-link-title="0" class="" data-icon-position="">Spinal CSF Leak Articles (Jan 2020-June 2024)</a></li>
<li class="menu-1185 menu-path-ajnrorg-cc-most-impactful-ajnr-articles  even " role="menuitem"><a href="http://www.ajnr.org/cc/most-impactful-ajnr-articles" data-hide-link-title="0" class="" data-icon-position="">Most Impactful AJNR Articles</a></li>
<li class="menu-1896 menu-path-ajnrorg-cc-2024-awards  odd last" role="menuitem"><a href="http://www.ajnr.org/cc/2024-Awards" data-hide-link-title="0" class="" data-icon-position="">2024 AJNR Journal Awards</a></li>
</ul></li>
<li class="menu-788 menuparent  menu-path-node-9  odd last" role="menuitem"><a href="/content/advertising" class="" data-icon-position="" data-hide-link-title="0">More</a><ul role="menu"><li class="menu-780 menu-path-node-960 first odd " role="menuitem"><a href="/content/subscriber-help-and-services" data-hide-link-title="0" class="" data-icon-position="">Subscribers</a></li>
<li class="menu-863 menu-path-smarketplacecopyrightcom-rs-ui-web-mp-details-journal-122810747  even " role="menuitem"><a href="https://marketplace.copyright.com/rs-ui-web/mp/details/journal/122810747" data-hide-link-title="0" class="" data-icon-position="">Permissions</a></li>
<li class="menu-782 menu-path-node-937  odd " role="menuitem"><a href="/page/content/Ads" data-hide-link-title="0" class="" data-icon-position="">Advertisers</a></li>
<li class="menu-790 menu-path-alerts  even " role="menuitem"><a href="/alerts" data-hide-link-title="0" class="" data-icon-position="">Alerts</a></li>
<li class="menu-791 menu-path-node-10  odd last" role="menuitem"><a href="/feedback" class="" data-icon-position="" data-hide-link-title="0">Feedback</a></li>
</ul></li>
</ul></nav>
    </div>
  </div>
</div><div class="block block-menu text-right block-menu-social-media block-menu-menu-social-media even block-without-title" id="block-menu-menu-social-media">
  <div class="block-inner clearfix">
                
    <div class="content clearfix">
      <nav class="menubar-nav"><ul class="menu" role="menu"><li class="first leaf" role="menuitem"><a href="http://www.twitter.com/TheAJNR" target="_blank" class="link-icon-only link-icon"><span class="hw-icon-x-twitter"></span> <span class="title element-invisible">Follow AJNR on Twitter</span></a></li>
<li class="leaf" role="menuitem"><a href="http://www.facebook.com/AmJNeuroradiol" target="_blank" class="link-icon-only link-icon"><span class="icon-facebook-sign icon-2x"></span> <span class="title element-invisible">Visit AJNR on Facebook</span></a></li>
<li class="leaf" role="menuitem"><a href="https://www.instagram.com/the_ajnr/?hl=en" class="link-icon-only link-icon"><span class="icon-instagram icon-2x"></span> <span class="title element-invisible">Follow AJNR on Instagram</span></a></li>
<li class="leaf" role="menuitem"><a href="https://www.linkedin.com/company/american-journal-of-neuroradiology" class="link-icon-only link-icon"><span class="icon-linkedin icon-2x"></span> <span class="title element-invisible">Join AJNR on LinkedIn</span></a></li>
<li class="last leaf" role="menuitem"><a href="/rss" class="link-icon-only link-icon"><span class="icon-rss icon-2x"></span> <span class="title element-invisible">RSS Feeds</span></a></li>
</ul></nav>    </div>
  </div>
</div>  </div>
</div>
  </div>
  
  <div id="zone-header" class="zone zone-header clearfix container-30">
  	      <div id="messages" class="grid-28 prefix-1 suffix-1"><div role="alert" class="messages single-msg status highwire">
<div class="msg-col-left"><span class="icon icon-info-sign"></span></div><div class="msg-col-right">Getting new auth cookie, if you see this message a lot, tell someone!</div></div>
</div>
          </div>
</header>    
      <section id="section-content" class="section section-content">
    
  <div id="zone-content" class="zone zone-content clearfix container-30">    
        
    <div class="grid-28 suffix-1 prefix-1 region region-content" id="region-content">
  <div class="region-inner region-content-inner">
    <a id="main-content"></a>
                        <div class="block block-system block-main block-system-main odd block-without-title" id="block-system-main">
  <div class="block-inner clearfix">
                
    <div class="content clearfix">
      <div class="panel-display panels-960-layout jcore-2col-layout" >
	  <div class="panel-row-wrapper panel-row-first clearfix">
		
		<div class="top-wrapper">
			<div class="panel-panel panel-region-top">
			  <div class="inside"><div class="panel-pane pane-highwire-article-citation" >
  
      
  
  <div class="pane-content">
    <div class="highwire-article-citation highwire-citation-type-highwire-article node11219--5" data-node-nid="11219" id="top-node-11219--62103330603" data-pisa="ajnr;20/3/461" data-pisa-master="ajnr;20/3/461" data-apath="/ajnr/20/3/461.atom" data-hw-author-tooltip-instance="highwire_author_tooltip"><div class="highwire-cite highwire-cite-highwire-article highwire-citation-jcore-article-title-complete clearfix has-author-tooltip highwire-citation-highwire-article-top-a">
  
  
      <div class="highwire-cite-overline"><span  class="highwire-cite-metadata-article-type highwire-cite-metadata">Research Article</span><span class="separator-pipe"></span><span  class="highwire-cite-metadata-art-cat highwire-cite-metadata"><span class="wrapper">HEAD AND NECK</span></span></div>
  
      <div class="highwire-cite-access"><span class="highwire-citation-access highwire-citation-access-check" data-pisa-id="ajnr;20/3/461" data-atom-uri="/ajnr/20/3/461.atom" data-request-view="full"></span></div>
  
      <h1 class="highwire-cite-title" id="page-title">Benign Expansile Lesions of the Sphenoid Sinus: Differentiation from Normal Asymmetry of the Lateral Recesses</h1>  
    	<div class="highwire-cite-authors"><span  class="highwire-citation-authors"><span class="highwire-citation-author first" data-delta="0">Jonathan S. Lewin</span>, <span class="highwire-citation-author" data-delta="1">Hugh D. Curtin</span>, <span class="highwire-citation-author" data-delta="2">Elizabeth Eelkema</span> and <span class="highwire-citation-author" data-delta="3">Nancy Obuchowski</span></span></div>
  
    	<div class="highwire-cite-metadata"><span  class="highwire-cite-metadata-journal highwire-cite-metadata">American Journal of Neuroradiology </span><span  class="highwire-cite-metadata-date highwire-cite-metadata">March 1999,  </span><span  class="highwire-cite-metadata-volume highwire-cite-metadata">20 </span><span  class="highwire-cite-metadata-issue highwire-cite-metadata">(3) </span><span  class="highwire-cite-metadata-pages highwire-cite-metadata">461-466; </span></div>
  
  
  
</div>
<div id="hw-article-author-popups-top-node-11219--62103330603" style="display: none;"><div class="author-tooltip-0"><div class="author-tooltip-name">Jonathan S. Lewin </div><ul class="author-tooltip-find-more"><li class="author-tooltip-gs-link first"><a href="/lookup/google-scholar?link_type=googlescholar&amp;gs_type=author&amp;author%5B0%5D=Jonathan%2BS.%2BLewin%2B" target="_blank" class="" data-icon-position="" data-hide-link-title="0">Find this author on Google Scholar</a></li><li class="author-tooltip-pubmed-link"><a href="/lookup/external-ref?access_num=Lewin%20JS&amp;link_type=AUTHORSEARCH" target="_blank" class="" data-icon-position="" data-hide-link-title="0">Find this author on PubMed</a></li><li class="author-site-search-link last"><a href="/search/author1%3AJonathan%2BS.%2BLewin%2B" rel="nofollow" class="" data-icon-position="" data-hide-link-title="0">Search for this author on this site</a></li></ul></div><div class="author-tooltip-1"><div class="author-tooltip-name">Hugh D. Curtin </div><ul class="author-tooltip-find-more"><li class="author-tooltip-gs-link first"><a href="/lookup/google-scholar?link_type=googlescholar&amp;gs_type=author&amp;author%5B0%5D=Hugh%2BD.%2BCurtin%2B" target="_blank" class="" data-icon-position="" data-hide-link-title="0">Find this author on Google Scholar</a></li><li class="author-tooltip-pubmed-link"><a href="/lookup/external-ref?access_num=Curtin%20HD&amp;link_type=AUTHORSEARCH" target="_blank" class="" data-icon-position="" data-hide-link-title="0">Find this author on PubMed</a></li><li class="author-site-search-link last"><a href="/search/author1%3AHugh%2BD.%2BCurtin%2B" rel="nofollow" class="" data-icon-position="" data-hide-link-title="0">Search for this author on this site</a></li></ul></div><div class="author-tooltip-2"><div class="author-tooltip-name">Elizabeth Eelkema </div><ul class="author-tooltip-find-more"><li class="author-tooltip-gs-link first"><a href="/lookup/google-scholar?link_type=googlescholar&amp;gs_type=author&amp;author%5B0%5D=Elizabeth%2BEelkema%2B" target="_blank" class="" data-icon-position="" data-hide-link-title="0">Find this author on Google Scholar</a></li><li class="author-tooltip-pubmed-link"><a href="/lookup/external-ref?access_num=Eelkema%20E&amp;link_type=AUTHORSEARCH" target="_blank" class="" data-icon-position="" data-hide-link-title="0">Find this author on PubMed</a></li><li class="author-site-search-link last"><a href="/search/author1%3AElizabeth%2BEelkema%2B" rel="nofollow" class="" data-icon-position="" data-hide-link-title="0">Search for this author on this site</a></li></ul></div><div class="author-tooltip-3"><div class="author-tooltip-name">Nancy Obuchowski </div><ul class="author-tooltip-find-more"><li class="author-tooltip-gs-link first"><a href="/lookup/google-scholar?link_type=googlescholar&amp;gs_type=author&amp;author%5B0%5D=Nancy%2BObuchowski%2B" target="_blank" class="" data-icon-position="" data-hide-link-title="0">Find this author on Google Scholar</a></li><li class="author-tooltip-pubmed-link"><a href="/lookup/external-ref?access_num=Obuchowski%20N&amp;link_type=AUTHORSEARCH" target="_blank" class="" data-icon-position="" data-hide-link-title="0">Find this author on PubMed</a></li><li class="author-site-search-link last"><a href="/search/author1%3ANancy%2BObuchowski%2B" rel="nofollow" class="" data-icon-position="" data-hide-link-title="0">Search for this author on this site</a></li></ul></div></div></div>  </div>

  
  </div>
</div>
			</div>
		</div>
	
	</div> <!-- /.panel-row-wrapper -->	
	  
  <div class="panel-row-wrapper clearfix">
		
		<div class="main-content-wrapper grid-17 suffix-1 alpha">
			<div class="panel-panel panel-region-content">
			  <div class="inside"><div class="panel-pane pane-highwire-panel-tabs pane-panels-ajax-tab-tabs" >
  
      
  
  <div class="pane-content">
    <div class="item-list"><ul class="tabs inline panels-ajax-tab"><li class="first"><a href="/content/20/3/461" class="panels-ajax-tab-tab" data-panel-name="jnl_ajnr_tab_art" data-target-id="highwire_article_tabs" data-entity-context="node:11219" data-trigger="" data-url-enabled="1">Article</a><a href="/panels_ajax_tab/jnl_ajnr_tab_art/node:11219/1" rel="nofollow" style="display:none" class="js-crawler-link"></a></li><li><a href="/content/20/3/461/tab-figures-data" class="panels-ajax-tab-tab" data-panel-name="jnl_ajnr_tab_data" data-target-id="highwire_article_tabs" data-entity-context="node:11219" data-trigger="tab-figures-data" data-url-enabled="1">Figures &amp; Data</a><a href="/panels_ajax_tab/jnl_ajnr_tab_data/node:11219/1" rel="nofollow" style="display:none" class="js-crawler-link"></a></li><li><a href="/content/20/3/461/tab-references" class="panels-ajax-tab-tab" data-panel-name="jnl_ajnr_tab_refs" data-target-id="highwire_article_tabs" data-entity-context="node:11219" data-trigger="tab-references" data-url-enabled="1">References</a><a href="/panels_ajax_tab/jnl_ajnr_tab_refs/node:11219/1" rel="nofollow" style="display:none" class="js-crawler-link"></a></li><li><a href="/content/20/3/461/tab-article-info" class="panels-ajax-tab-tab" data-panel-name="jnl_ajnr_tab_info" data-target-id="highwire_article_tabs" data-entity-context="node:11219" data-trigger="tab-article-info" data-url-enabled="1">Info &amp; Metrics</a><a href="/panels_ajax_tab/jnl_ajnr_tab_info/node:11219/1" rel="nofollow" style="display:none" class="js-crawler-link"></a></li><li class="last"><a href="/content/ajnr/20/3/461.full.pdf" class="panels-ajax-tab-tab" data-panel-name="jnl_ajnr_tab_pdf" data-target-id="highwire_article_tabs" data-entity-context="node:11219" data-trigger="tab-pdf" data-url-enabled="1"><i class="icon-file-alt"></i> PDF</a><a href="/panels_ajax_tab/jnl_ajnr_tab_pdf/node:11219/1" rel="nofollow" style="display:none" class="js-crawler-link"></a></li></ul></div>  </div>

  
  </div>
<div class="panel-separator"></div><div class="panel-pane pane-highwire-panel-tabs-container" >
  
      
  
  <div class="pane-content">
    <div data-panels-ajax-tab-preloaded="jnl_ajnr_tab_art" id="panels-ajax-tab-container-highwire_article_tabs" class="panels-ajax-tab-container"><div class="panels-ajax-tab-loading" style ="display:none"><img class="loading" src="http://ajnr-stage2.stage.highwire.org/sites/all/modules/contrib/panels_ajax_tab/images/loading.gif" alt="Loading" title="Loading" /></div><div class="panels-ajax-tab-wrap-jnl_ajnr_tab_art"><div class="panel-display panel-1col clearfix" >
  <div class="panel-panel panel-col">
    <div><div class="panel-pane pane-highwire-markup" >
  
      
  
  <div class="pane-content">
    <div class="highwire-markup"><div xmlns="http://www.w3.org/1999/xhtml" data-highwire-cite-ref-tooltip-instance="highwire_reflinks_tooltip" class="content-block-markup" xmlns:xhtml="http://www.w3.org/1999/xhtml"><div class="article abstract-view"><span class="highwire-journal-article-marker-start"></span><div class="section abstract" id="abstract-1"><h2>Abstract</h2><p id="p-1"><em>BACKGROUND AND PURPOSE</em>: There is a wide range of normal variation in sphenoid sinus development, especially in the size of the lateral recesses. The purpose of this study was to determine imaging characteristics that may help differentiate between opacification of a developmentally asymmetric lateral recess and a true expansile lesion of the sphenoid sinus.</p><p id="p-2"><em>METHODS:</em> Coronal CT was performed in seven patients with expansile or erosive benign lesions of the sphenoid sinus, and results were compared to a control population of 72 subjects with unopacified sphenoid sinuses. The degree of asymmetry of lateral recess development was assessed with particular attention to the separation of vidian's canal and the foramen rotundum (vidian-rotundum distance). The images were also examined for evidence of: erosion, defined as loss of the normal thin bony margin on at least two contiguous sections; apparent thinning of the sinus wall, defined as a focal apparent decrease in thickness again on at least two contiguous sections; and for vidian's canal or foramen rotundum rim erosion or flattening.</p><p id="p-3"><em>RESULTS:</em> Of the seven patients with expansile lesions, vidian's canal margin erosion was present in seven, unequivocal sinus expansion in three, wall erosion in three, wall thinning in three, erosion of the foramen rotundum in two, and flattening in the foramen rotundum in four. Forty-one of the 72 controls had lateral recess formation, 28 of which were asymmetric. The distance between vidian's canal and the foramen rotundum (vidian-rotundum distance) relied on the presence or absence of pneumatization, with a significantly larger distance in the presence of greater wing pneumatization. Examination of 24 controls revealed apparent thinning of the sinus wall, typically at the carotid groove, but no flattening, thinning, or erosion of the vidian canal or of the foramen rotundum.</p><p id="p-4"><em>CONCLUSION:</em> Examination of controls and patients with expansile or erosive lesions of the sphenoid sinus revealed side-to-side asymmetry in the development of the sinus and lateral recess, making subtle expansion difficult to assess. Furthermore, variability in the vidian-rotundum distance correlated with degree of pneumatization, and did not necessarily reflect expansion. Thus, in the absence of gross sinus wall erosion, flattening or erosion of the rims of vidian's canal or the foramen rotundum provides the most specific evidence of an expansile or erosive process within the sinus.</p></div><ul class="copyright-statement"><li class="fn" id="copyright-statement-1">Copyright © American Society of Neuroradiology</li></ul><span class="highwire-journal-article-marker-end"></span></div><span class="related-urls"></span></div><a href="http://ajnr-stage2.stage.highwire.org/content/20/3/461.full" class="hw-link hw-link-article-full-text" data-icon-position="" data-hide-link-title="0">View Full Text</a></div>  </div>

  
  </div>
<div class="panel-separator"></div><div class="panel-pane pane-highwire-article-trendmd" >
  
      
  
  <div class="pane-content">
    <div id="trendmd-suggestions"></div>  </div>

  
  </div>
</div>
  </div>
</div>
</div></div>  </div>

  
  </div>
<div class="panel-separator"></div><div class="panel-pane pane-highwire-node-pager" >
  
      
  
  <div class="pane-content">
    <div class="pager highwire-pager pager-mini clearfix highwire-node-pager highwire-article-pager"><span class="pager-prev"><a href="/content/20/3/457" title="Neurocutaneous Melanosis Presenting with Intracranial Amelanotic Melanoma" rel="prev" class="pager-link-prev link-icon"><span class="icon-circle-arrow-left"></span> <span class="title">Previous</span></a></span><span class="pager-next"><a href="/content/20/3/467" title="Atrophy of the Posterior Cricoarytenoid Muscle as an Indicator of Recurrent Laryngeal Nerve Palsy" rel="next" class="pager-link-next link-icon-right link-icon"><span class="title">Next</span> <span class="icon-circle-arrow-right"></span></a></span></div>  </div>

  
  </div>
<div class="panel-separator"></div><div class="panel-pane pane-highwire-back-to-top" >
  
      
  
  <div class="pane-content">
    <a href="#page" class="back-to-top" data-icon-position="" data-hide-link-title="0"><span class="icon-chevron-up"></span> Back to top</a>  </div>

  
  </div>
</div>
			</div>
		</div>
		
		<div class="sidebar-right-wrapper grid-10 omega">
			<div class="panel-panel panel-region-sidebar-right">
			  <div class="inside"><div class="panel-pane pane-panels-mini pane-jnl-ajnr-art-issue pane-style-alt-content" >
  
        <h2 class="pane-title">In this issue</h2>
    
  
  <div class="pane-content">
    <div class="panel-display panel-1col clearfix" id="mini-panel-jnl_ajnr_art_issue">
  <div class="panel-panel panel-col">
    <div><div class="panel-pane pane-highwire-article-citation" >
  
      
  
  <div class="pane-content">
    <div class="highwire-article-citation highwire-citation-type-highwire-issue node1706" data-node-nid="1706" id="node-1706--2489895861" data-pisa="ajnr;20/3" data-pisa-master="ajnr;20/3" data-apath="/ajnr/20/3.atom"><div class="highwire-cite highwire-cite-highwire-issue highwire-citation-jcore-issue-widget clearfix">
    
  
  <div class="highwire-cite-col">
      
      
          <a href="/content/20/3" class="highwire-cite-linked-title" data-icon-position="" data-hide-link-title="0"><span class="highwire-cite-title">American Journal of Neuroradiology</span></a>      
      
        	<div class="highwire-cite-metadata"><span  class="highwire-cite-metadata-volume highwire-cite-metadata">Vol. 20</span>, <span  class="highwire-cite-metadata-issue highwire-cite-metadata">Issue 3 </span><div  class="highwire-cite-metadata-pubdate highwire-cite-metadata">1 Mar 1999 </div></div>
      
      
        	<div class="highwire-cite-extras"><div class='highwire-article-citation-variant-list'><ul class="links variants-list"><li class="toc first"><a href="/content/20/3.toc" class="highwire-variant-link variant-toc " title="Table of Contents" rel="alternate" type="text/html" data-icon-position="" data-hide-link-title="0">Table of Contents</a></li><li class="index-by-author last"><a href="/content/20/3.index-by-author" class="highwire-variant-link variant-index-by-author " title="Index by author" rel="alternate" data-icon-position="" data-hide-link-title="0">Index by author</a></li></ul></div></div>
      </div>

</div></div>  </div>

  
  </div>
</div>
  </div>
</div>
  </div>

  
  </div>
<div class="panel-separator"></div><div class="panel-pane pane-panels-mini pane-jnl-ajnr-ad-rhs" >
  
      
  
  <div class="pane-content">
    <div class="panel-display panel-1col clearfix" id="mini-panel-jnl_ajnr_ad_rhs">
  <div class="panel-panel panel-col">
    <div><div class="panel-pane pane-dfp-pane text-center" >
  
      
  
  <div class="pane-content">
    <div id="dfp-ad-rhs-wrapper" class="dfp-tag-wrapper">
<div class="slug">Advertisement</div>
<div  id="dfp-ad-rhs" class="dfp-tag-wrapper">
  <script type="text/javascript">
    googletag.cmd.push(function() {
      googletag.display("dfp-ad-rhs");
    });
  </script>
</div>
</div>  </div>

  
  </div>
</div>
  </div>
</div>
  </div>

  
  </div>
<div class="panel-separator"></div><div class="panel-pane pane-panels-mini pane-jnl-ajnr-art-tools" >
  
      
  
  <div class="pane-content">
    <div id="mini-panel-jnl_ajnr_art_tools" class="highwire-2col-stacked panel-display">
	  
  <div class="panel-row-wrapper clearfix">
		<div class="content-left-wrapper content-column">
          <div class="panel-panel panel-region-content-left">
            <div class="inside"><div class="panel-pane pane-highwire-variant-link" >
  
      
  
  <div class="pane-content">
    <a href="/content/ajnr/20/3/461.full-text.print" target="_blank" rel="nofollow" class="link-icon"><span class="icon-print"></span> <span class="title">Print</span></a>  </div>

  
  </div>
<div class="panel-pane pane-highwire-variant-link text-no-wrap" >
  
      
  
  <div class="pane-content">
    <a href="/content/ajnr/20/3/461.full-text.pdf" target="_blank" class="link-icon"><span class="icon-download-alt"></span> <span class="title">Download PDF</span></a>  </div>

  
  </div>
<div class="panel-pane pane-minipanel-dialog-link pane-jnl-ajnr-art-email" >
  
      
  
  <div class="pane-content">
    <div class='minipanel-dialog-wrapper'><div class='minipanel-dialog-link-link'><a href="/" oncontextmenu="javascript: return false;" class="minipanel-dialog-link-trigger link-icon" title="Email this Article"><span class="icon-envelope"></span> <span class="title">Email Article</span></a></div><div class='minipanel-dialog-link-mini' style='display:none'><div class="panel-display panel-1col clearfix" id="mini-panel-jnl_ajnr_art_email">
  <div class="panel-panel panel-col">
    <div><div class="panel-pane pane-block pane-forward-form pane-forward" >
  
      
  
  <div class="pane-content">
    <form action="/content/20/3/461.abstract" method="post" id="forward-form" accept-charset="UTF-8"><div><div id="edit-instructions" class="form-item form-item-label-before form-type-item">
 <p>Thank you for your interest in spreading the word on American Journal of Neuroradiology.</p><p>NOTE: We only request your email address so that the person you are recommending the page to knows that you wanted them to see it, and that it is not junk mail. We do not capture any email address.</p>
</div>
<div class="form-item form-item-label-before form-type-textfield form-item-email">
  <label for="edit-email">Your Email <span class="form-required" title="This field is required.">*</span></label>
 <input type="text" id="edit-email" name="email" value="" size="58" maxlength="256" class="form-text required" />
</div>
<div class="form-item form-item-label-before form-type-textfield form-item-name">
  <label for="edit-name">Your Name <span class="form-required" title="This field is required.">*</span></label>
 <input type="text" id="edit-name" name="name" value="" size="58" maxlength="256" class="form-text required" />
</div>
<div class="form-item form-item-label-before form-type-textarea form-item-recipients">
  <label for="edit-recipients">Send To <span class="form-required" title="This field is required.">*</span></label>
 <div class="form-textarea-wrapper resizable"><textarea id="edit-recipients" name="recipients" cols="50" rows="5" class="form-textarea required"></textarea></div>
<div class="description">Enter multiple addresses on separate lines or separate them with commas.</div>
</div>
<div id="edit-page" class="form-item form-item-label-before form-type-item">
  <label for="edit-page">You are going to email the following </label>
 <a href="/content/20/3/461" class="active" data-icon-position="" data-hide-link-title="0">Benign Expansile Lesions of the Sphenoid Sinus: Differentiation from Normal Asymmetry of the Lateral Recesses</a>
</div>
<div id="edit-subject" class="form-item form-item-label-before form-type-item">
  <label for="edit-subject">Message Subject </label>
 (Your Name) has sent you a message from American Journal of Neuroradiology
</div>
<div id="edit-body" class="form-item form-item-label-before form-type-item">
  <label for="edit-body">Message Body </label>
 (Your Name) thought you would like to see the American Journal of Neuroradiology web site.
</div>
<div class="form-item form-item-label-before form-type-textarea form-item-message">
  <label for="edit-message--2">Your Personal Message </label>
 <div class="form-textarea-wrapper resizable"><textarea id="edit-message--2" name="message" cols="50" rows="10" class="form-textarea"></textarea></div>
</div>
<input type="hidden" name="path" value="node/11219" />
<input type="hidden" name="path_cid" value="" />
<input type="hidden" name="forward_footer" value="" />
<input type="hidden" name="form_build_id" value="form-QwcGK0asXBU-OK1UKVzTHpa7Yickqppu2P6wr39CQUs" />
<input type="hidden" name="form_id" value="forward_form" />
<fieldset class="captcha form-wrapper"><legend><span class="fieldset-legend">CAPTCHA</span></legend><div class="fieldset-wrapper"><div class="fieldset-description">This question is for testing whether or not you are a human visitor and to prevent automated spam submissions.</div><input type="hidden" name="captcha_sid" value="108731470" />
<input type="hidden" name="captcha_token" value="512dccbfcc51f043bc8187fedfb59a28" />
<input type="hidden" name="captcha_response" value="Google no captcha" />
<div class="g-recaptcha" data-sitekey="6LfnJVIUAAAAAE-bUOMg0MJGki4lqSvDmhJp19fN" data-theme="light" data-type="image"></div></div></fieldset>
<div class="form-actions form-wrapper" id="edit-actions"><input type="submit" id="edit-submit" name="op" value="Send Message" class="form-submit" /></div></div></form>  </div>

  
  </div>
</div>
  </div>
</div>
</div></div>  </div>

  
  </div>
<div class="panel-pane pane-minipanel-dialog-link pane-jnl-ajnr-cite-tool" >
  
      
  
  <div class="pane-content">
    <div class='minipanel-dialog-wrapper'><div class='minipanel-dialog-link-link'><a href="/highwire/citation/11219/download" oncontextmenu="javascript: return false;" class="minipanel-dialog-link-trigger link-icon" title="Citation Tools"><span class="icon-globe"></span> <span class="title">Citation Tools</span></a></div><div class='minipanel-dialog-link-mini' style='display:none'><div class="panel-display panel-1col clearfix" id="mini-panel-jnl_ajnr_cite_tool">
  <div class="panel-panel panel-col">
    <div><div class="panel-pane pane-highwire-citation-export" >
  
      
  
  <div class="pane-content">
    <div class="highwire-citation-export">  
  <div class="highwire-citation-info">
      <div class="highwire-article-citation highwire-citation-type-highwire-article cite-tool-node11219" data-node-nid="11219" id="citation-node-11219--2841822302" data-pisa="ajnr;20/3/461" data-pisa-master="ajnr;20/3/461" data-apath="/ajnr/20/3/461.atom"><div class="highwire-cite highwire-cite-highwire-article highwire-citation-jcore-standard clearfix">
  
  
  
  
      <div class="highwire-cite-title">Benign Expansile Lesions of the Sphenoid Sinus: Differentiation from Normal Asymmetry of the Lateral Recesses</div>  
    	<div class="highwire-cite-authors"><span  class="highwire-citation-authors"><span class="highwire-citation-author first" data-delta="0"><span class="nlm-given-names">Jonathan S.</span> <span class="nlm-surname">Lewin</span></span>, <span class="highwire-citation-author" data-delta="1"><span class="nlm-given-names">Hugh D.</span> <span class="nlm-surname">Curtin</span></span>, <span class="highwire-citation-author" data-delta="2"><span class="nlm-given-names">Elizabeth</span> <span class="nlm-surname">Eelkema</span></span>, <span class="highwire-citation-author" data-delta="3"><span class="nlm-given-names">Nancy</span> <span class="nlm-surname">Obuchowski</span></span></span></div>
  
    	<div class="highwire-cite-metadata"><span  class="highwire-cite-metadata-journal highwire-cite-metadata">American Journal of Neuroradiology </span><span  class="highwire-cite-metadata-date highwire-cite-metadata">Mar 1999, </span><span  class="highwire-cite-metadata-volume highwire-cite-metadata">20 </span><span  class="highwire-cite-metadata-issue highwire-cite-metadata">(3) </span><span  class="highwire-cite-metadata-pages highwire-cite-metadata">461-466; </span></div>
  
  
  
</div>
</div>  </div>
  <div class="highwire-citation-formats">
  	      <h2>Citation Manager Formats</h2>
        <div class="highwire-citation-formats-links">
      <span class="Z3988" title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&amp;rft.spage=461&amp;rft.epage=466&amp;rft.atitle=Benign%20Expansile%20Lesions%20of%20the%20Sphenoid%20Sinus%3A%20Differentiation%20from%20Normal%20Asymmetry%20of%20the%20Lateral%20Recesses&amp;rft.volume=20&amp;rft.issue=3&amp;rft.date=1999-03-01%2000%3A00%3A00&amp;rft.stitle&amp;rft.jtitle=American%20Journal%20of%20Neuroradiology&amp;rft.au=Lewin%2C+Jonathan+S.&amp;rft.au=Curtin%2C+Hugh+D.&amp;rft.au=Eelkema%2C+Elizabeth&amp;rft.au=Obuchowski%2C+Nancy"></span><ul class="hw-citation-links inline button button-alt button-grid clearfix"><li class="bibtext first"><a href="/highwire/citation/11219/bibtext" class="hw-download-citation-link" data-icon-position="" data-hide-link-title="0">BibTeX</a></li><li class="bookends"><a href="/highwire/citation/11219/bookends" class="hw-download-citation-link" data-icon-position="" data-hide-link-title="0">Bookends</a></li><li class="easybib"><a href="/highwire/citation/11219/easybib" class="hw-download-citation-link" data-icon-position="" data-hide-link-title="0">EasyBib</a></li><li class="endnote-tagged"><a href="/highwire/citation/11219/endnote-tagged" class="hw-download-citation-link" data-icon-position="" data-hide-link-title="0">EndNote (tagged)</a></li><li class="endnote-8-xml"><a href="/highwire/citation/11219/endnote-8-xml" class="hw-download-citation-link" data-icon-position="" data-hide-link-title="0">EndNote 8 (xml)</a></li><li class="medlars"><a href="/highwire/citation/11219/medlars" class="hw-download-citation-link" data-icon-position="" data-hide-link-title="0">Medlars</a></li><li class="mendeley"><a href="/highwire/citation/11219/mendeley" class="hw-download-citation-link" data-icon-position="" data-hide-link-title="0">Mendeley</a></li><li class="papers"><a href="/highwire/citation/11219/papers" class="hw-download-citation-link" data-icon-position="" data-hide-link-title="0">Papers</a></li><li class="refworks-tagged"><a href="/highwire/citation/11219/refworks-tagged" class="hw-download-citation-link" data-icon-position="" data-hide-link-title="0">RefWorks Tagged</a></li><li class="reference-manager"><a href="/highwire/citation/11219/reference-manager" class="hw-download-citation-link" data-icon-position="" data-hide-link-title="0">Ref Manager</a></li><li class="ris"><a href="/highwire/citation/11219/ris" class="hw-download-citation-link" data-icon-position="" data-hide-link-title="0">RIS</a></li><li class="zotero last"><a href="/highwire/citation/11219/zotero" class="hw-download-citation-link" data-icon-position="" data-hide-link-title="0">Zotero</a></li></ul>    </div>
  </div>
</div>
  </div>

  
  </div>
</div>
  </div>
</div>
</div></div>  </div>

  
  </div>
</div>
          </div>
        </div>
        
        <div class="content-right-wrapper content-column">
          <div class="panel-panel panel-region-content-right">
            <div class="inside"><div class="panel-pane pane-highwire-share-link highwire_clipboard_link_ajax"  id="shareit">
  
      
  
  <div class="pane-content">
    <a href="/" class="link-icon"><span class="icon-share-alt"></span> <span class="title">Share</span></a>  </div>

  
  </div>
<div class="panel-pane pane-panels-mini pane-jnl-ajnr-share highwire_clipboard_form_ajax_shareit" >
  
      
  
  <div class="pane-content">
    <div class="panel-display panel-1col clearfix" id="mini-panel-jnl_ajnr_share">
  <div class="panel-panel panel-col">
    <div><div class="panel-pane pane-highwire-article-citation large-margin-bottom" >
  
      
  
  <div class="pane-content">
    <div class="highwire-article-citation highwire-citation-type-highwire-article node11219--3" data-node-nid="11219" id="share-node-11219--4552010618" data-pisa="ajnr;20/3/461" data-pisa-master="ajnr;20/3/461" data-apath="/ajnr/20/3/461.atom"><div class="highwire-cite highwire-cite-highwire-article highwire-citation-jcore-standard clearfix">
  
  
  
  
      <div class="highwire-cite-title">Benign Expansile Lesions of the Sphenoid Sinus: Differentiation from Normal Asymmetry of the Lateral Recesses</div>  
    	<div class="highwire-cite-authors"><span  class="highwire-citation-authors"><span class="highwire-citation-author first" data-delta="0"><span class="nlm-given-names">Jonathan S.</span> <span class="nlm-surname">Lewin</span></span>, <span class="highwire-citation-author" data-delta="1"><span class="nlm-given-names">Hugh D.</span> <span class="nlm-surname">Curtin</span></span>, <span class="highwire-citation-author" data-delta="2"><span class="nlm-given-names">Elizabeth</span> <span class="nlm-surname">Eelkema</span></span>, <span class="highwire-citation-author" data-delta="3"><span class="nlm-given-names">Nancy</span> <span class="nlm-surname">Obuchowski</span></span></span></div>
  
    	<div class="highwire-cite-metadata"><span  class="highwire-cite-metadata-journal highwire-cite-metadata">American Journal of Neuroradiology </span><span  class="highwire-cite-metadata-date highwire-cite-metadata">Mar 1999, </span><span  class="highwire-cite-metadata-volume highwire-cite-metadata">20 </span><span  class="highwire-cite-metadata-issue highwire-cite-metadata">(3) </span><span  class="highwire-cite-metadata-pages highwire-cite-metadata">461-466; </span></div>
  
  
  
</div>
</div>  </div>

  
  </div>
<div class="panel-separator"></div><div class="panel-pane pane-highwire-article-clipboard-copy large-margin-bottom" >
  
      
  
  <div class="pane-content">
    <div class = "clipboard-copy">
  <span class="label-url">
    <label for="dynamic">Share This Article:</label>
  </span>
  <span class="input-text-url">
    <input type="text" id="dynamic" value="http://ajnr-stage2.stage.highwire.org/content/20/3/461" size="50"/>
  </span>
  <span class="copy-button button">
    <button id="copy-dynamic" class="clipboardjs-button" data-clipboard-target="#dynamic" data-clipboard-alert-style="tooltip" data-clipboard-alert-text="Copied!">Copy</button>
  </span>
</div>
  </div>

  
  </div>
<div class="panel-separator"></div><div class="panel-pane pane-service-links" >
  
      
  
  <div class="pane-content">
    <div class="service-links"><a href="http://del.icio.us/post?url=http%3A//ajnr-stage2.stage.highwire.org/content/20/3/461&amp;title=Benign%20Expansile%20Lesions%20of%20the%20Sphenoid%20Sinus%3A%20Differentiation%20from%20Normal%20Asymmetry%20of%20the%20Lateral%20Recesses" id="delicious" title="Bookmark this post on del.icio.us" class="service-links-delicious" rel="nofollow" target="_blank" data-icon-position="" data-hide-link-title="0"><img src="http://ajnr-stage2.stage.highwire.org/sites/all/modules/highwire/highwire/images/delicious-32.png" alt="del.icio.us logo" /></a> <a href="http://twitter.com/share?url=http%3A//ajnr-stage2.stage.highwire.org/content/20/3/461&amp;text=Benign%20Expansile%20Lesions%20of%20the%20Sphenoid%20Sinus%3A%20Differentiation%20from%20Normal%20Asymmetry%20of%20the%20Lateral%20Recesses" id="twitter" title="Share this on Twitter" class="service-links-twitter" rel="nofollow" target="_blank" data-icon-position="" data-hide-link-title="0"><img src="http://ajnr-stage2.stage.highwire.org/sites/all/modules/highwire/highwire/images/twitter.png" alt="Twitter logo" /></a> <a href="http://www.facebook.com/sharer.php?u=http%3A//ajnr-stage2.stage.highwire.org/content/20/3/461&amp;t=Benign%20Expansile%20Lesions%20of%20the%20Sphenoid%20Sinus%3A%20Differentiation%20from%20Normal%20Asymmetry%20of%20the%20Lateral%20Recesses" id="facebook" title="Share on Facebook" class="service-links-facebook" rel="nofollow" target="_blank" data-icon-position="" data-hide-link-title="0"><img src="http://ajnr-stage2.stage.highwire.org/sites/all/modules/highwire/highwire/images/fb-blue.png" alt="Facebook logo" /></a> <a href="http://www.mendeley.com/import/?url=http%3A//ajnr-stage2.stage.highwire.org/content/20/3/461&amp;title=Benign%20Expansile%20Lesions%20of%20the%20Sphenoid%20Sinus%3A%20Differentiation%20from%20Normal%20Asymmetry%20of%20the%20Lateral%20Recesses" id="mendeley" title="Share on Mendeley" class="service-links-mendeley" rel="nofollow" target="_blank" data-icon-position="" data-hide-link-title="0"><img src="http://ajnr-stage2.stage.highwire.org/sites/all/modules/highwire/highwire/images/mendeley.png" alt="Mendeley logo" /></a></div>  </div>

  
  </div>
</div>
  </div>
</div>
  </div>

  
  </div>
<div class="panel-pane pane-service-links" >
  
      
  
  <div class="pane-content">
    <div class="service-links"><div class="item-list"><ul><li class="first"><a href="http://twitter.com/share?url=http%3A//ajnr-stage2.stage.highwire.org/content/20/3/461&amp;count=horizontal&amp;via=&amp;text=Benign%20Expansile%20Lesions%20of%20the%20Sphenoid%20Sinus%3A%20Differentiation%20from%20Normal%20Asymmetry%20of%20the%20Lateral%20Recesses&amp;counturl=http%3A//ajnr-stage2.stage.highwire.org/content/20/3/461" class="twitter-share-button service-links-twitter-widget" id="twitter_widget" title="Tweet This" rel="nofollow" target="_blank" data-icon-position="" data-hide-link-title="0"><span class="element-invisible">Tweet Widget</span></a></li><li><a href="http://www.facebook.com/plugins/like.php?href=http%3A//ajnr-stage2.stage.highwire.org/content/20/3/461&amp;layout=button_count&amp;show_faces=false&amp;action=like&amp;colorscheme=light&amp;width=100&amp;height=21&amp;font=&amp;locale=" id="facebook_like" title="I Like it" class="service-links-facebook-like" rel="nofollow" target="_blank" data-icon-position="" data-hide-link-title="0"><span class="element-invisible">Facebook Like</span></a></li><li class="last"><a href="http://ajnr-stage2.stage.highwire.org/content/20/3/461" id="google_plus_one" title="Plus it" class="service-links-google-plus-one" rel="nofollow" target="_blank" data-icon-position="" data-hide-link-title="0"><span class="element-invisible">Google Plus One</span></a></li></ul></div></div>  </div>

  
  </div>
</div>
          </div>
        </div>
	</div> <!-- /.panel-row-wrapper -->	
	
	</div>

  </div>

  
  </div>
<div class="panel-separator"></div><div class="panel-pane pane-highwire-article-nav mobile-hidden pane-style-alt-content" >
  
        <h2 class="pane-title">Jump to section</h2>
    
  
  <div class="pane-content">
    <div class="highwire-list-wrapper highwire-article-nav highwire-nav-float"><div class="highwire-list"><ul data-highwire-float="1" data-highwire-float-class="grid-10 alpha omega"><li class="parent first odd"><a href="/content/20/3/461" class="highwire-article-nav-jumplink" data-panel-ajax-tab="jnl_ajnr_tab_art" data-is-tab-link="true" data-icon-position="" data-hide-link-title="0">Article</a><div class="highwire-list"><ul><li class="first odd"><a href="#abstract-1" class="highwire-article-nav-jumplink first" data-panel-ajax-tab="jnl_ajnr_tab_art" data-icon-position="" data-hide-link-title="0">Abstract</a></li><li class="even"><a href="#sec-2" class="highwire-article-nav-jumplink" data-panel-ajax-tab="jnl_ajnr_tab_art" data-icon-position="" data-hide-link-title="0">Methods</a></li><li class="odd"><a href="#sec-3" class="highwire-article-nav-jumplink" data-panel-ajax-tab="jnl_ajnr_tab_art" data-icon-position="" data-hide-link-title="0">Results</a></li><li class="even"><a href="#sec-6" class="highwire-article-nav-jumplink" data-panel-ajax-tab="jnl_ajnr_tab_art" data-icon-position="" data-hide-link-title="0">Discussion</a></li><li class="odd"><a href="#sec-7" class="highwire-article-nav-jumplink" data-panel-ajax-tab="jnl_ajnr_tab_art" data-icon-position="" data-hide-link-title="0">Conclusion</a></li><li class="even"><a href="#fn-group-1" class="highwire-article-nav-jumplink" data-panel-ajax-tab="jnl_ajnr_tab_art" data-icon-position="" data-hide-link-title="0">Footnotes</a></li><li class="last odd"><a href="#ref-list-1" class="highwire-article-nav-jumplink last" data-panel-ajax-tab="jnl_ajnr_tab_art" data-icon-position="" data-hide-link-title="0">References</a></li></ul></div></li><li class="even"><a href="/content/20/3/461/tab-figures-data" class="highwire-article-nav-jumplink" data-panel-ajax-tab="jnl_ajnr_tab_data" data-is-tab-link="true" data-icon-position="" data-hide-link-title="0">Figures &amp; Data</a></li><li class="odd"><a href="/content/20/3/461/tab-references" class="highwire-article-nav-jumplink" data-panel-ajax-tab="jnl_ajnr_tab_refs" data-is-tab-link="true" data-icon-position="" data-hide-link-title="0">References</a></li><li class="even"><a href="/content/20/3/461/tab-article-info" class="highwire-article-nav-jumplink" data-panel-ajax-tab="jnl_ajnr_tab_info" data-is-tab-link="true" data-icon-position="" data-hide-link-title="0">Info &amp; Metrics</a></li><li class="last odd"><a href="/content/20/3/461.full.pdf" class="highwire-article-nav-jumplink" data-icon-position="" data-hide-link-title="0"><i class="icon-file-alt"></i> PDF</a></li></ul></div></div>  </div>

  
  </div>
<div class="panel-separator"></div><div class="panel-pane pane-panels-mini pane-jnl-ajnr-accordion" >
  
      
  
  <div class="pane-content">
    <div class="panel-display panel-1col clearfix" id="mini-panel-jnl_ajnr_accordion">
  <div class="panel-panel panel-col">
    <div><div id="highwire_article_accordion_container"><h3 ><i class="icon-caret-right"></i> Related Articles</h3><div><div class="highwire-list highwire-related-articles highwire-article-citation-list"><ul class="highwire-related-articles-list"><li class="first last odd"><div class="no-results">No related articles found.</div></li></ul></div><div class='highwire-list-footer'><div class="highwire-related-articles-footer"><ul class="links inline"><li class="related-pubmed first"><a href="/lookup/external-ref?link_type=MED_NBRS&amp;access_num=10219412" target="_blank" class="" data-icon-position="" data-hide-link-title="0">PubMed</a></li><li class="related-google-scholar last"><a href="/lookup/google-scholar?link_type=googlescholar&amp;gs_type=related&amp;author%5B0%5D=Jonathan%2BS.%2BLewin&amp;author%5B1%5D=Hugh%2BD.%2BCurtin&amp;author%5B2%5D=Elizabeth%2BEelkema&amp;author%5B3%5D=Nancy%2BObuchowski&amp;title=Benign%2BExpansile%2BLesions%2Bof%2Bthe%2BSphenoid%2BSinus%3A%2BDifferentiation%2Bfrom%2BNormal%2BAsymmetry%2Bof%2Bthe%2BLateral%2BRecesses&amp;publication_year=1999&amp;path=content/20/3/461" target="_blank" class="" data-icon-position="" data-hide-link-title="0">Google Scholar</a></li></ul></div></div></div><h3 ><i class="icon-caret-right"></i> Cited By...</h3><div><div class="highwire-list highwire-cited-by"><ul><li class="first last odd"><a href="http://iv.iiarjournals.org/cgi/content/full/29/2/281" class="" data-icon-position="" data-hide-link-title="0"><div class="highwire-cite-title">Nasal Speech Associated with Hyperaeration of the Sphenoid Sinus</div></a><div class="variant-links"></div></li></ul></div><div class='highwire-list-footer'><ul class="links inline"><li class="citing-cross-ref first"><a href="/crossref-forward-links/ajnr/20/3/461#crossref" class="hw-crossref hw-crossref-link-ajax" data-list-wrapper="hw-crossref-list-wrapper" target="_blank" data-icon-position="" data-hide-link-title="0">Crossref</a></li><li class="citing-google-scholar last"><a href="/lookup/google-scholar?link_type=googlescholar&amp;gs_type=citedby&amp;path=content/20/3/461" target="_blank" class="" data-icon-position="" data-hide-link-title="0">Google Scholar</a></li></ul></div><div title="Crossref Cited-by Linking Search Results" style="display:none;" class="hw-crossref-list-wrapper"><p class = "hw-crossref-message">This article has not yet been cited by articles in journals that are participating in Crossref Cited-by Linking.</p></div></div><h3 ><i class="icon-caret-right"></i> More in this TOC Section</h3><div><div class="highwire-list highwire-article-citation-list"><ul><li class="first odd"><div class="highwire-article-citation highwire-citation-type-highwire-article node11904" data-node-nid="11904" id="node-11904--289862726" data-pisa="ajnr;33/5/944" data-pisa-master="ajnr;ajnr.A2892" data-apath="/ajnr/33/5/944.atom"><div class="highwire-cite highwire-cite-highwire-article highwire-citation-jcore-standard-title-only clearfix">
  
  
  
  
      <a href="/content/33/5/944" class="highwire-cite-linked-title" data-icon-position="" data-hide-link-title="0"><span class="highwire-cite-title">Correlation of Apparent Diffusion Coefficient at 3T with Prognostic Parameters of Retinoblastoma</span></a>  
  
  
  
  
</div>
</div></li><li class="even"><div class="highwire-article-citation highwire-citation-type-highwire-article node11910" data-node-nid="11910" id="node-11910--223887259" data-pisa="ajnr;33/5/949" data-pisa-master="ajnr;ajnr.A2885" data-apath="/ajnr/33/5/949.atom"><div class="highwire-cite highwire-cite-highwire-article highwire-citation-jcore-standard-title-only clearfix">
  
  
  
  
      <a href="/content/33/5/949" class="highwire-cite-linked-title" data-icon-position="" data-hide-link-title="0"><span class="highwire-cite-title">Parathyroid Lesions: Characterization with Dual-Phase Arterial and Venous Enhanced CT of the Neck</span></a>  
  
  
  
  
</div>
</div></li><li class="last odd"><div class="highwire-article-citation highwire-citation-type-highwire-article node11870" data-node-nid="11870" id="node-11870--2345329875" data-pisa="ajnr;33/4/761" data-pisa-master="ajnr;ajnr.A2834" data-apath="/ajnr/33/4/761.atom"><div class="highwire-cite highwire-cite-highwire-article highwire-citation-jcore-standard-title-only clearfix">
  
  
  
  
      <a href="/content/33/4/761" class="highwire-cite-linked-title" data-icon-position="" data-hide-link-title="0"><span class="highwire-cite-title">Efficacy of Diffusion-Weighted Imaging for the Differentiation between Lymphomas and Carcinomas of the Nasopharynx and Oropharynx: Correlations of Apparent Diffusion Coefficients and Histologic Features</span></a>  
  
  
  
  
</div>
</div></li></ul></div><div class='highwire-list-footer'><a href="/content/by/section/HEAD%20AND%20NECK" class="" data-icon-position="" data-hide-link-title="0">Show more <span class="wrapper">HEAD AND NECK</span></a></div></div><h3 ><i class="icon-caret-right"></i> Similar Articles</h3><div><div class="highwire-search-similar-ajax-wrapper" id="highwire-search-similar-articles-list-1"><div class="highwire-ajax-loading"><span class="icon-spinner icon-spin icon-2x"></span></div></div></div></div></div>
  </div>
</div>
  </div>

  
  </div>
</div>
			</div>
		</div>
	
	</div> <!-- /.panel-row-wrapper -->	
	
	</div>

    </div>
  </div>
</div><div class="block block-panels-mini more-padding-top mobile-hiddens block-jnl-ajnr-ad-bot-leaderboard block-panels-mini-jnl-ajnr-ad-bot-leaderboard even block-without-title" id="block-panels-mini-jnl-ajnr-ad-bot-leaderboard">
  <div class="block-inner clearfix">
                
    <div class="content clearfix">
      <div class="panel-display panel-1col clearfix" id="mini-panel-jnl_ajnr_ad_bot_leaderboard">
  <div class="panel-panel panel-col">
    <div><div class="panel-pane pane-dfp-pane text-center" >
  
      
  
  <div class="pane-content">
    <div id="dfp-ad-bottom_leaderboard-wrapper" class="dfp-tag-wrapper">
<div class="slug">Advertisement</div>
<div  id="dfp-ad-bottom_leaderboard" class="dfp-tag-wrapper">
  <script type="text/javascript">
    googletag.cmd.push(function() {
      googletag.display("dfp-ad-bottom_leaderboard");
    });
  </script>
</div>
</div>  </div>

  
  </div>
</div>
  </div>
</div>
    </div>
  </div>
</div>      </div>
</div>  </div>
</section>    
  
      <footer id="section-footer" class="section section-footer">
    
  <div id="zone-postscript" class="zone zone-postscript clearfix container-30">
    <div class="grid-28 suffix-1 prefix-1 region region-postscript-fourth" id="region-postscript-fourth">
  <div class="region-inner region-postscript-fourth-inner">
    <div class="block block-panels-mini block-jnl-ajnr-footer block-panels-mini-jnl-ajnr-footer odd block-without-title" id="block-panels-mini-jnl-ajnr-footer">
  <div class="block-inner clearfix">
                
    <div class="content clearfix">
      <div class="panel-display panels-960-row jcore-row-4col clearfix" id="mini-panel-jnl_ajnr_footer">
  <div class="panel-panel panel-region-col-1 grid-7 alpha">
    <div class="inside"><div class="panel-pane pane-block pane-menu-navigate pane-menu" >
  
        <h2 class="pane-title">News and Updates</h2>
    
  
  <div class="pane-content">
    <nav class="menubar-nav"><ul class="menu" role="menu"><li class="first leaf" role="menuitem"><a href="https://www.ajnr.org/cc/2024-Awards" data-hide-link-title="0" class="" data-icon-position="">2024 Journal Award Winners</a></li>
<li class="last leaf" role="menuitem"><a href="/page/content/Reviewer-Recognition" data-hide-link-title="0" class="" data-icon-position="">Thanks to our 2023 Distinguished Reviewers</a></li>
</ul></nav>  </div>

  
  </div>
</div>
  </div>
  <div class="panel-panel panel-region-col-2 grid-7">
    <div class="inside"><div class="panel-pane pane-block pane-menu-more-information pane-menu" >
  
        <h2 class="pane-title">Resources</h2>
    
  
  <div class="pane-content">
    <nav class="menubar-nav"><ul class="menu" role="menu"><li class="first leaf" role="menuitem"><a href="/page/content/EBM" data-hide-link-title="0" class="" data-icon-position="">Evidence-Based Medicine Level Guide</a></li>
<li class="leaf" role="menuitem"><a href="/content/browse-podcast-archives" data-hide-link-title="0" class="" data-icon-position="">AJNR Podcast Archive</a></li>
<li class="leaf" role="menuitem"><a href="/content/institutional-subscriptions" data-hide-link-title="0" class="" data-icon-position="">Librarian Resources</a></li>
<li class="last leaf" role="menuitem"><a href="http://www.ajnr.org/page/content/Terms-and-Conditions" data-hide-link-title="0" class="" data-icon-position="">Terms and Conditions</a></li>
</ul></nav>  </div>

  
  </div>
</div>
  </div>
  <div class="panel-panel panel-region-col-3 grid-7">
    <div class="inside"><div class="panel-pane pane-block pane-menu-add-journals pane-menu" >
  
        <h2 class="pane-title">Opportunities</h2>
    
  
  <div class="pane-content">
    <nav class="menubar-nav"><ul class="menu" role="menu"><li class="first last leaf" role="menuitem"><a href="/page/content/Publons" data-hide-link-title="0" class="" data-icon-position="">Get Peer Review Credit from Publons</a></li>
</ul></nav>  </div>

  
  </div>
</div>
  </div>
  <div class="panel-panel panel-region-col-4 grid-7 omega">
    <div class="inside"><div class="panel-pane pane-block pane-menu-other-services pane-menu" >
  
        <h2 class="pane-title">American Society of Neuroradiology</h2>
    
  
  <div class="pane-content">
    <nav class="menubar-nav"><ul class="menu" role="menu"><li class="first leaf" role="menuitem"><a href="http://www.neurographics.org/" data-hide-link-title="0" class="" data-icon-position="">Neurographics</a></li>
<li class="leaf" role="menuitem"><a href="http://www.asnr.org/index.php/education/fellowship-portal/" data-hide-link-title="0" class="" data-icon-position="">Fellowship Portal</a></li>
<li class="last leaf" role="menuitem"><a href="https://www.asnr.org/membership-types/" data-hide-link-title="0" class="" data-icon-position="">Not an ASNR Member? Join Now</a></li>
</ul></nav>  </div>

  
  </div>
</div>
  </div>
</div>    </div>
  </div>
</div>  </div>
</div>  </div>
  
  <div id="zone-footer" class="zone zone-footer clearfix container-30">
    <div class="grid-28 suffix-1 prefix-1 region region-footer-first" id="region-footer-first">
  <div class="region-inner region-footer-first-inner">
    <div class="block block-panels-mini block-jnl-ajnr-foot-info block-panels-mini-jnl-ajnr-foot-info odd block-without-title" id="block-panels-mini-jnl-ajnr-foot-info">
  <div class="block-inner clearfix">
                
    <div class="content clearfix">
      <div class="panel-display panel-1col clearfix" id="mini-panel-jnl_ajnr_foot_info">
  <div class="panel-panel panel-col">
    <div><div class="panel-pane pane-page-logo-footer" >
  
      
  
  <div class="pane-content">
    <img class="footer-logo" src="http://ajnr-stage2.stage.highwire.org/sites/default/files/ajnr-logo.png" alt="" />  </div>

  
  </div>
<div class="panel-separator"></div><div class="panel-pane pane-snippet pane-footer-copyright-text" >
  
      
  
  <div class="pane-content">
    <div class="snippet footer-copyright-text" id="footer-copyright-text">
  
      
  <div class="snippet-content">
    <p>&copy; 2025 by the <a href="http://www.asnr.org">American Society of Neuroradiology</a> All rights, including for text and data mining, AI training, and similar technologies, are reserved.<br />
Print ISSN: 0195-6108 Online ISSN: 1936-959X</p>
  </div>

</div>
  </div>

  
  </div>
<div class="panel-separator"></div><div class="panel-pane pane-highwire-branding" >
  
      
  
  <div class="pane-content">
    <a href="http://home.highwire.org" target="_blank" class="highwire-branding-link" data-icon-position="" data-hide-link-title="0"><img class="logo-highwire" src="http://ajnr-stage2.stage.highwire.org/sites/all/modules/highwire/highwire/plugins/content_types/images/logo_small_hw_white.png" width="190" height="31" alt="Powered by HighWire" /></a>  </div>

  
  </div>
</div>
  </div>
</div>
    </div>
  </div>
</div>  </div>
</div>  </div>
</footer>  </div>    <div class="region region-page-bottom" id="region-page-bottom">
  <div class="region-inner region-page-bottom-inner">
      </div>
</div><script type="text/javascript" src="/sites/default/files/advagg_js/js__bnwyEQSuZLC-kZnFqCi5iE02nOCzM7DjY7zYxcN9nsQ__VBiBT_qq_eHMMO2Q1rXK1u-hHff31XLUkmi9dgjuPeY__Op4k-kV4DoWc7bsUP7umKmZ0WXfmoYdRDoZFPNSd-oM.js"></script>
<script type="text/javascript" src="/sites/default/files/advagg_js/js__GM3GJPR36rRIz0TRkjC5OQwrioSyN9aoYRivDhCO_AM__qAl84FcCv2jyN22yFGS5Oc85cjd9zKX6p_cFNLGhe-M__Op4k-kV4DoWc7bsUP7umKmZ0WXfmoYdRDoZFPNSd-oM.js" async="async"></script>
<script type="text/javascript" src="/sites/default/files/advagg_js/js__puuQ6qZuZflSOzhCnY-jgY7Fv9AlRwAQ8SzEc4pSqOs__QdvWVdmkPpxtURk1sK0nHm-KZ4OJQjVuYZTnLqK1Isw__Op4k-kV4DoWc7bsUP7umKmZ0WXfmoYdRDoZFPNSd-oM.js"></script>
<script type="text/javascript">
<!--//--><![CDATA[//><!--
function euCookieComplianceLoadScripts() {}
//--><!]]>
</script>
<script type="text/javascript">
<!--//--><![CDATA[//><!--
var eu_cookie_compliance_cookie_name = "";
//--><!]]>
</script>
<script type="text/javascript" src="/sites/default/files/advagg_js/js__WcTpt-w0y1FyXrxZNriX8Ts1KjsFTDpdvZaw9yhRn24__aFJpdvsZPb1v9rWrq-WXbz_WQ9IThQN-mFTCdm1cfXc__Op4k-kV4DoWc7bsUP7umKmZ0WXfmoYdRDoZFPNSd-oM.js"></script>
  </body>
</html>