Assessment of MRI and dynamic contrast-enhanced MRI in the differential diagnosis of adenomatoid odontogenic tumor.
The radiographical differentiation of adenomatoid odontogenic tumor (AOT) from dentigerous cysts, calcifying odontogenic cysts, calcifying epithelial odontogenic tumors, odontogenic keratocysts and amelobastomas is sometimes difficult. We attempted to differentiate AOT from other lesions similar to AOT in radiographic findings using MRI. The MRI features of AOT in our three cases included homogeneous low SI in the cystic portion and homogeneous intermediate SI in the solid portion on T1WI, homogeneous high SI in the cystic portion and intermediate to slightly high SI in the solid portion on T2WI and enhancement of only the solid portion on CE-T1WI although none of the sequences included SI of calcifications. The contrast index curves in the three cases of AOT showed a gradual increase to 300 s, which signified a benign tumor. These MRI features were characteristic features of AOT and might be a basis for differentiating AOT from the above possible lesions in radiographic examinations.
Department of Oral and Maxillofacial Radiology, Field of Tumor Biology, Graduate School of Medicine and Dentistry, Okayama University, 2-5-1, Shikata-cho, 700-8525, Japan. asaumi@md.okayama-u.ac.jp
Jun-ichi
J
Asaumi
Yoshinobu
Y
Yanagi
Hironobu
H
Konouchi
Miki
M
Hisatomi
Hidenobu
H
Matsuzaki
Hiroshi
H
Shigehara
Kanji
K
Kishi
D000293:Adolescent; D000328:Adult; D003287:Contrast Media; D003803:Dentigerous Cyst / Q000175:diagnosis; D003937:Diagnosis, Differential; D005260:Female; D019786:Gadolinium DTPA; D006801:Humans; D007089:Image Enhancement / Q000379:methods*; D007091:Image Processing, Computer-Assisted / Q000379:methods; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008339:Mandibular Neoplasms / Q000175:diagnosis* / Q000473:pathology; D009808:Odontogenic Tumors / Q000175:diagnosis* / Q000473:pathology
D003287:Contrast Media; D019786:Gadolinium DTPA