Abstract

A34-year-old woman had a brown-red nodule (8×7mm) surrounded by brownish macule (14×11mm) on her right lower leg. Histologically in the nodule, there were atypical melanocytes proliferated as solitary unit or in nests thorought the dermis, it showed many features of a Spitz nevus. However in the pigmented lesion atypical melanocytes proliferated mainly solitary in the epidermis, we considered it melanoma in situ.
Therefore we diagnosed the tumor as malignant melanoma and performed a wide resection and chemotherapy.