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PT  - JOURNAL ARTICLE
AU  - Yang, B.T.
AU  - Wang, Y.Z.
AU  - Wang, X.Y.
AU  - Wang, Z.C.
AU  - Xian, J.F.
AU  - Li, J.
TI  - Fibrous Dysplasia-Like Appearance of the Frontal Process of the Maxilla on CT: Prevalence in North China
AID  - 10.3174/ajnr.A2322
DP  - 2011 Mar 01
TA  - American Journal of Neuroradiology
PG  - 471--473
VI  - 32
IP  - 3
4099  - http://www.ajnr.org/content/32/3/471.short
4100  - http://www.ajnr.org/content/32/3/471.full
SO  - Am. J. Neuroradiol.2011 Mar 01; 32
AB  - SUMMARY: The frontal process of the maxilla occasionally shows a localized FD-like appearance. The purpose of this study was to determine its prevalence and findings on CT. A retrospective study of 1000 consecutive paranasal sinus CT scans was preformed on outpatients without a history of trauma or previous surgery in our hospital during 6 months. CT images were interpreted independently by 2 experienced head and neck radiologists on a PACS system in a bone window setting. Of the 1000 patients (546 males; 454 females), 51 (5.1%,41 males and 10 females) had an FD-like appearance in the frontal process of the maxilla. There was a statistically significant difference between sexes (P &amp;lt; .001). Twenty-nine (56.9%) entities arose from the right frontal process and 22 (43.1%) from the left frontal process. These entities, with well-defined margins, were located at the base of the frontal process of the maxilla, appearing as an ovoid or triangular configuration on axial-plane CT and as a spindle or elliptic shape on the coronal plane. The mean maximal diameter was 9.8 mm (range, 3.6–16.1 mm). These entities exhibited a pagetoid appearance (type I) in 37 (72.5%), a ground-glass appearance (type II) in 8 (15.7%), and a cyst-like appearance (type III) in 6 (11.8%) patients on CT. The FD-like appearance of the frontal process of the maxilla is not rare and can be readily detected by CT. FDfibrous dysplasia