We report a case in which malignant melanoma of the vagina showed some MR s
ignal changes after radiotherapy. Before radiotherapy, the tumour had sligh
tly high signal intensity on T-1 weighted images and was enhanced after gad
olinium-DTPA administration. After radiotherapy, the signal intensity of th
e tumour increased conspicuously on both T-1 weighted images and fat suppre
ssion T-1 weighted images.