title: Assessment of pleomorphic adenomas using MRI and dynamic contrast enhanced MRI.
abstract: We evaluated magnetic resonance images (MRI) and the value of dynamic contrast enhanced MRI (DCE-MRI) of pleomorphic adenomas retrospectively. MRI was performed for 18 pleomorphic adenomas, including 11 cases with DCE-MRI. We obtained the following results on the MRI and DCE-MRI. (a). Pleomorphic adenomas showed a predilection for homogeneous intermediate signal intensity on T1-weighted images (T1WI), heterogeneous high signal intensity on T2-weighted images, and heterogeneous enhancement on Gd-T1WI. (b). Of 11 contrast index (CI) curves of pleomorphic adenomas, nine CI curves (81.8%) increased gradually to 600 s or increased gradually, reached a plateau, and sustained the plateau to 600 s. The remaining two (18.2%) increased gradually and decreased gradually thereafter. (c). CI curves reached the maximum CI index at 135-300 s.
authors.affiliation: Department of Oral and Maxillofacial Radiology, Okayama University, 2-5-1, Shikata-cho, Okayama-city, Okayama 700-8525, Japan. tomi@md.okayama-u.ac.jp
authors.forename: Miki
authors.initials: M
authors.lastname: Hisatomi
authors.forename: Jun-ichi
authors.initials: J
authors.lastname: Asaumi
authors.forename: Yoshinobu
authors.initials: Y
authors.lastname: Yanagi
authors.forename: Hironobu
authors.initials: H
authors.lastname: Konouchi
authors.forename: Hidenobu
authors.initials: H
authors.lastname: Matsuzaki
authors.forename: Yasutoshi
authors.initials: Y
authors.lastname: Honda
authors.forename: Kanji
authors.initials: K
authors.lastname: Kishi
mesh_terms: D008949:Adenoma, Pleomorphic / Q000175:diagnosis*; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D003287:Contrast Media; D005260:Female; D019786:Gadolinium DTPA; D006801:Humans; D007089:Image Enhancement; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D009062:Mouth Neoplasms / Q000175:diagnosis*; D012189:Retrospective Studies; D012680:Sensitivity and Specificity
chemical_list: D003287:Contrast Media; D019786:Gadolinium DTPA