title: Assessment of ameloblastomas using MRI and dynamic contrast-enhanced MRI.
abstract: We retrospectively evaluated magnetic resonance images (MRI) and dynamic contrast-enhanced MRI (DCE-MRI) of ameloblastomas. MRI and DCE-MRI were performed for 10 ameloblastomas. We obtained the following results from the MRI and DCE-MRI. (a) Ameloblastomas can be divided into solid and cystic portions on the basis of MR signal intensities. (b) Ameloblastomas show a predilection for intermediate signal intensity on T1WI, high signal intensity on T2WI, and well enhancement in the solid portion; they also show a homogeneous intermediate signal intensity on T1WI and homogeneous high signal intensity on T2WI, and no enhancement in the cystic portion. (c) The mural nodule or thick wall can be detected in ameloblastomas lesions. (d) CI curves of ameloblastomas show two patterns: the first pattern increases, reaches a plateau at 100-300 s, then sustains the plateau or decreases gradually to 600-900 s, while the other increases relatively rapidly, reaches a plateau at 90-120 s, then decreases relatively rapidly to 300 s, and decreases gradually thereafter. There was no difference in the CI curve patterns among primary and recurrent cases, a case with glandular odontogenic tumor in ameloblastoma or among histopathological types such as plexiform, follicular, mixed, desmoplastic, and unicystic type.
authors.affiliation: Department of Oral and Maxillofacial Radiology, Field of Tumor Biology, Graduate School of Medicine and Dentistry, Okayama University Graduate Schools, 2-5-1, Shikata-cho, Okayama 700-8525, Japan. tomi@md.okayama-u.ac.jp
authors.forename: Jun-ichi
authors.initials: J
authors.lastname: Asaumi
authors.forename: Miki
authors.initials: M
authors.lastname: Hisatomi
authors.forename: Yoshinobu
authors.initials: Y
authors.lastname: Yanagi
authors.forename: Hidenobu
authors.initials: H
authors.lastname: Matsuzaki
authors.forename: Yong Suk
authors.initials: YS
authors.lastname: Choi
authors.forename: Noriko
authors.initials: N
authors.lastname: Kawai
authors.forename: Hironobu
authors.initials: H
authors.lastname: Konouchi
authors.forename: Kanji
authors.initials: K
authors.lastname: Kishi
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000564:Ameloblastoma / Q000175:diagnosis*; D003287:Contrast Media / Q000008:administration & dosage; D003937:Diagnosis, Differential; D005260:Female; D019786:Gadolinium DTPA; D006801:Humans; D007089:Image Enhancement / Q000379:methods*; D021621:Imaging, Three-Dimensional / Q000379:methods; D007568:Jaw / Q000473:pathology*; D007573:Jaw Neoplasms / Q000175:diagnosis*; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D013997:Time Factors
chemical_list: D003287:Contrast Media; D019786:Gadolinium DTPA