Figure 2. (a) On the gadolinium-diethyltriaminepentaacetic acid (Gd-DTPA)-enhanced T1 weighted MR image before treatment, peripheral enhancement is seen in the anterior portion of the tongue. (b) Positron emission tomography (PET) before treatment shows a high uptake area in the left side of the tongue, corresponding to the enhanced area on the T1 weighted MR image. (c) High uptake is observed on PET–CT obtained 3 years after treatment.