Abstract
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 < .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.
Highlights
ObjectivesThe purpose of this study was to determine its prevalence and findings on CT
A retrospective review of paranasal sinus CT scans of 1000 consecutive outpatients who were consecutively selected by a PACS system in our hospital between August 1, 2008, and January 31, 2009, was performed
472 Yang AJNR 32 ͉ Mar 2011 ͉ www.ajnr.org development of the frontal process, the apposition of the frontal process, and lacrimal bone trapping some of these embryonic cells, eventually leading to unchecked fibro-osseous proliferation.[1,4]
Summary
The purpose of this study was to determine its prevalence and findings on CT
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