Fibrous dysplasia-like appearance of the frontal process of the maxilla on CT: prevalence in North China.
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.
Department of Radiology, Beijing Tongren Hospital, Capital Medical University, Beijing, China. cjr.yangbentao@vip.163.com
B T
BT
Yang
Y Z
YZ
Wang
X Y
XY
Wang
Z C
ZC
Wang
J F
JF
Xian
J
J
Li
D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002648:Child; D002681:China / Q000453:epidemiology; D005260:Female; D005359:Fibrous Dysplasia, Polyostotic / Q000000981:diagnostic imaging*; D006801:Humans; D008297:Male; D008437:Maxilla / Q000002:abnormalities* / Q000000981:diagnostic imaging*; D008875:Middle Aged; D015995:Prevalence; D011859:Radiography; D018570:Risk Assessment; D012307:Risk Factors; D055815:Young Adult
Otolaryngol Clin North Am. 2006 Jun;39(3):585-600, x
16757233
AJR Am J Roentgenol. 1995 Mar;164(3):679-82
7863893
Ophthalmic Plast Reconstr Surg. 2008 Sep-Oct;24(5):423-5
18806675
Neuroimaging Clin N Am. 2003 Aug;13(3):525-40
14631689
Radiographics. 1990 May;10(3):519-37
2188311
J Neurosurg. 2007 Sep;107(3):504-8
17886547
Auris Nasus Larynx. 2001 Jan;28(1):103-5
11137371
Eur Arch Otorhinolaryngol. 2007 May;264(5):495-8
17203310
ORL J Otorhinolaryngol Relat Spec. 1996 Jan-Feb;58(1):55-8
8718541
Am J Roentgenol Radium Ther Nucl Med. 1957 Jan;77(1):71-88
13381861
J Laryngol Otol. 1998 Oct;112(10):964-8
10211223
Clin Radiol. 2004 Jan;59(1):11-25
14697371