本文报导228例非典型性黑色素细胞增生及148例浅表播散性黑色素瘤(肿瘤厚度小于0.76毫米)。两者发生部位类似。前者平均年龄为38岁,后者44岁。伴有良性色素痣者,前者占50％,后者53％。根据组织学观察,作者提出非典型性黑色素细胞增生发展为早期浅表播散性黑色素瘤的顺序为:(1)非典型性黑色素细胞增生(40例);(2)非典型性黑色素 This article reports 228 cases of atypical melanocytic hyperplasia and 148 cases of superficial disseminated melanoma (tumor thickness less than 0.76 mm). Both parts of the occurrence of similar. The former average age of 38 years old, the latter 44 years old. With benign pigmentary mole, the former accounted for 50%, the latter 53%. According to histological observations, the authors suggest that the sequence of atypia melanocytic hyperplasia to early superficial disseminated melanoma is (1) atypical melanocytic hyperplasia (40), (2) atypical melanin