A case of malignant melanoma with spontaneous regression of the primary lesion.

We reported a case of malignant melanoma with spontaneous regression of the primary lesion. A 50-year-old man noticed a subcutaneous tumor in his left neck 3 months before his visit to us. He was aware of a black macules on his left cheek for the past 5 years, most of which recently disappeared. A histological examination of the tumor showed lymph node metastasis of malignant melanoma. We found no other lesions on his whole body except for the macules on his cheek. Consequently, we diagnosed this case as malignant melanoma, pTxN1M0, stage III, which showed the spontaneous regression of the primary lesion. [Skin Cancer (Japan) 2000; 15: 250-253]