舌癌のMRI診断-Dynamic MRIも含めて,-

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MRI studies were performed on 29 patients with tongue tumors.26 cases were fresh, others were recurrent.Signal intensity of tongue tumor was not characteristic and specific, and it was a low-iso signal on T1 weighted image (WI), heterogeneously iso-high signal intensity on T2 WI, heterogeneous enhancement on gadolinium-DTPA enhanced image compared to muscle signal intensity.<BR>In 3 of 29 patients, the tongue tumor invaded to the mandible.With regard to the grasping tumor invasion to the mandible, the STIR method was superior to T1, T2 WI of the spin echo method.Dynamic enhanced MR images were performed in 6 of 29 patients. Dynamic.change of signal intensity after gadolinium-DTPA administeration were assessed with fast low angle shot imaging.<BR>On dynamic study at about 20 seconds after gadolinium-DTPA injection, the first signal intensity in the periphery of the tumor gradually began to increase.Maximum signal intensity of the tumor showed at about 70 seconds after gadolinium-DTPA injection. In search from 0 to 5 minutes, after the tongue tumor showed maximum signal intensity, its signal maintain the maximum.Necroic and peritumorous edema showed a significantly lower and more gradual increase in signal intensity than adjacent neoplastic tissue on dynamic enhanced MRI.
社団法人日本口腔外科学会の論文