恶性黑色素瘤占原发恶性肿瘤的1%,好发于皮肤、粘膜、眼球,也有发生于其他部位的个案报道,但原发于前列腺者罕见。我们遇见1例,并经活检病理证实,报告如下。患者　男,72岁。排尿困难40天。查体:一般情况可,全身皮肤粘膜无异常。肛诊示前列腺Ⅱ°增大,质稍硬,表面不平有结节,中 Malignant melanoma accounts for 1% of primary malignant tumors, which occur in the skin, mucous membranes and eyeballs. Cases of other malignant melanomas have also been reported. However, it is rare in primary malignant tumors. We met 1 case and confirmed by biopsy pathology, the report is as follows. Male patient, 72 years old. Difficulty urinating for 40 days. Physical examination: the general situation can be, no abnormal skin and mucous membranes. Prostate diagnosis of prostate Ⅱ ° increased, slightly qualitative hard, uneven surface nodules, in