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Assessment of pleomorphic adenomas using MRI and dynamic contrast enhanced MRI
Miki Hisatomi1, Jun-ichi Asaumi, Yoshinobu Yanagi
1Department of Oral and Maxillofacial Radiology, Okayama University, 2-5-1, Shikata-cho, Okayama-city, Okayama 700-8525, Japan. tomi@md.okayama-u.ac.jp
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.