Figure 3. (a) The gadolinium-diethyltriaminepentaacetic acid (Gd-DTPA)-enhanced T₁ weighted MR image before treatment showed an enhanced tumour on the right side of the tongue. (b) On a Gd-DTPA-enhanced T₁ weighted image taken 15 months after the end of treatment, a slightly high-intensity area is seen at the right side of the tongue. (c) Positron emission tomography (PET)–CT after treatment shows a high uptake area in the right side of the tongue.