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<meta name="DC.Title" content="MR and CT correlation of cholesterol cysts of the petrous bone." />
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<meta name="DC.Description" content="Four patients with expansile cystic lesions of the petrous bone had correlative CT and MR scans. Characteristic findings were noted on MR scans obtained with T1- (TR = 400-800, TE = 25-32) and T2- (TR = 2000-3000, TE = 64-80) weighted images. These findings include an expansile cystic lesion centered in the petrous apex with high signal intensity on both the T1- and T2-weighted images, compatible with subacute or chronic hemorrhage. This signal pattern is distinct from the typical intradural epidermoid tumor, which has signal intensities similar to CSF with low signal on T1-weighted images and high signal on T2-weighted images. Surgical exploration yielded similar findings of a cyst containing free-flowing, brown watery fluid. Histologically, an inflammatory response was present as well as a variable number of cholesterol crystals. There was little identifiable capsular tissue but abundant evidence of subacute or chronic hematoma. The nomenclature of the etiology in these four cases is currently in some controversy, with some authors classifying these lesions as epidermoid or primary cholesteatomas while others call them cholesterol granulomas or giant cholesterol cysts. Whatever they are named, the MR image pattern is consistent and is dominated by findings indicative of hemoglobin breakdown products." />
<meta name="DC.Contributor" content="C Griffin" />
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<meta name="citation_abstract" lang="en" content="&lt;p&gt;Four patients with expansile cystic lesions of the petrous bone had correlative CT and MR scans. Characteristic findings were noted on MR scans obtained with T1- (TR = 400-800, TE = 25-32) and T2- (TR = 2000-3000, TE = 64-80) weighted images. These findings include an expansile cystic lesion centered in the petrous apex with high signal intensity on both the T1- and T2-weighted images, compatible with subacute or chronic hemorrhage. This signal pattern is distinct from the typical intradural epidermoid tumor, which has signal intensities similar to CSF with low signal on T1-weighted images and high signal on T2-weighted images. Surgical exploration yielded similar findings of a cyst containing free-flowing, brown watery fluid. Histologically, an inflammatory response was present as well as a variable number of cholesterol crystals. There was little identifiable capsular tissue but abundant evidence of subacute or chronic hematoma. The nomenclature of the etiology in these four cases is currently in some controversy, with some authors classifying these lesions as epidermoid or primary cholesteatomas while others call them cholesterol granulomas or giant cholesterol cysts. Whatever they are named, the MR image pattern is consistent and is dominated by findings indicative of hemoglobin breakdown products.&lt;/p&gt;" />
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<meta name="twitter:description" content="Four patients with expansile cystic lesions of the petrous bone had correlative CT and MR scans. Characteristic findings were noted on MR scans obtained with T1- (TR = 400-800, TE = 25-32) and T2- (TR = 2000-3000, TE = 64-80) weighted images. These findings include an expansile cystic lesion centered in the petrous apex with high signal intensity on both the T1- and T2-weighted images, compatible with subacute or chronic hemorrhage. This signal pattern is distinct from the typical intradural epidermoid tumor, which has signal intensities similar to CSF with low signal on T1-weighted images and high signal on T2-weighted images. Surgical exploration yielded similar findings of a cyst containing free-flowing, brown watery fluid. Histologically, an inflammatory response was present as well as a variable number of cholesterol crystals. There was little identifiable capsular tissue but abundant evidence of subacute or chronic hematoma. The nomenclature of the etiology in these four cases is currently in some controversy, with some authors classifying these lesions as epidermoid or primary cholesteatomas while others call them cholesterol granulomas or giant cholesterol cysts. Whatever they are named, the MR image pattern is consistent and is dominated by findings indicative of hemoglobin breakdown products." />
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<meta name="og-description" property="og:description" content="Four patients with expansile cystic lesions of the petrous bone had correlative CT and MR scans. Characteristic findings were noted on MR scans obtained with T1- (TR = 400-800, TE = 25-32) and T2- (TR = 2000-3000, TE = 64-80) weighted images. These findings include an expansile cystic lesion centered in the petrous apex with high signal intensity on both the T1- and T2-weighted images, compatible with subacute or chronic hemorrhage. This signal pattern is distinct from the typical intradural epidermoid tumor, which has signal intensities similar to CSF with low signal on T1-weighted images and high signal on T2-weighted images. Surgical exploration yielded similar findings of a cyst containing free-flowing, brown watery fluid. Histologically, an inflammatory response was present as well as a variable number of cholesterol crystals. There was little identifiable capsular tissue but abundant evidence of subacute or chronic hematoma. The nomenclature of the etiology in these four cases is currently in some controversy, with some authors classifying these lesions as epidermoid or primary cholesteatomas while others call them cholesterol granulomas or giant cholesterol cysts. Whatever they are named, the MR image pattern is consistent and is dominated by findings indicative of hemoglobin breakdown products." />
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      <h1 class="highwire-cite-title" id="page-title">MR and CT correlation of cholesterol cysts of the petrous bone.</h1>  
    	<div class="highwire-cite-authors"><span  class="highwire-citation-authors"><span class="highwire-citation-author first" data-delta="0">C Griffin</span>, <span class="highwire-citation-author" data-delta="1">R DeLaPaz</span> and <span class="highwire-citation-author" data-delta="2">D Enzmann</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">September 1987,  </span><span  class="highwire-cite-metadata-volume highwire-cite-metadata">8 </span><span  class="highwire-cite-metadata-issue highwire-cite-metadata">(5) </span><span  class="highwire-cite-metadata-pages highwire-cite-metadata">825-829; </span></div>
  
  
  
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<div id="hw-article-author-popups-top-node-5176--6380118245" style="display: none;"><div class="author-tooltip-0"><div class="author-tooltip-name">C Griffin </div><div class="author-tooltip-affiliation"><span class="author-tooltip-text"><div class='author-affiliation'>Department of Radiology, Stanford University School of Medicine, CA 94305.</div></span></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=C%2BGriffin%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=Griffin%20C&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%3AC%2BGriffin%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">R DeLaPaz </div><div class="author-tooltip-affiliation"><span class="author-tooltip-text"><div class='author-affiliation'>Department of Radiology, Stanford University School of Medicine, CA 94305.</div></span></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=R%2BDeLaPaz%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=DeLaPaz%20R&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%3AR%2BDeLaPaz%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">D Enzmann </div><div class="author-tooltip-affiliation"><span class="author-tooltip-text"><div class='author-affiliation'>Department of Radiology, Stanford University School of Medicine, CA 94305.</div></span></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=D%2BEnzmann%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=Enzmann%20D&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%3AD%2BEnzmann%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>

  
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        	<div class="highwire-cite-metadata"><span  class="highwire-cite-metadata-volume highwire-cite-metadata">Vol. 8</span>, <span  class="highwire-cite-metadata-issue highwire-cite-metadata">Issue 5 </span><div  class="highwire-cite-metadata-pubdate highwire-cite-metadata">1 Sep 1987 </div></div>
      
      
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      <div class="highwire-cite-title">MR and CT correlation of cholesterol cysts of the petrous bone.</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">C</span> <span class="nlm-surname">Griffin</span></span>, <span class="highwire-citation-author" data-delta="1"><span class="nlm-given-names">R</span> <span class="nlm-surname">DeLaPaz</span></span>, <span class="highwire-citation-author" data-delta="2"><span class="nlm-given-names">D</span> <span class="nlm-surname">Enzmann</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">Sep 1987, </span><span  class="highwire-cite-metadata-volume highwire-cite-metadata">8 </span><span  class="highwire-cite-metadata-issue highwire-cite-metadata">(5) </span><span  class="highwire-cite-metadata-pages highwire-cite-metadata">825-829; </span></div>
  
  
  
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    	<div class="highwire-cite-authors"><span  class="highwire-citation-authors"><span class="highwire-citation-author first" data-delta="0"><span class="nlm-given-names">C</span> <span class="nlm-surname">Griffin</span></span>, <span class="highwire-citation-author" data-delta="1"><span class="nlm-given-names">R</span> <span class="nlm-surname">DeLaPaz</span></span>, <span class="highwire-citation-author" data-delta="2"><span class="nlm-given-names">D</span> <span class="nlm-surname">Enzmann</span></span></span></div>
  
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