患者,男,54岁,以粘液脓血便两个月于1990年10月16日入院。伴里急后重,大便变细,便时有肿物脱出肛门外,有剧烈疼痛,便后肿块自行回纳,疼痛缓解。体检:发育正常,生命体征稳定,心肺正常。腹部平软,肝脾肋下未触及,腹部未触及包块。直肠指诊:膝胸位距肛门3cm处1～7点有5×4×4cm的肿块,表面不平,突入肠腔,无明显触痛,指套带有血迹。化验检查正常。肛镜取活组织检查提示恶性黑色素瘤。经常规肠道准备后,行恶性黑色素瘤腹会阴切除术。切除标本:黑色肿瘤 The patient, male, 54 years old, was admitted to the hospital on October 16, 1990 with mucous pus and blood for two months. With tenesmus, the stool becomes thinner, there is a mass out of the anus, there is severe pain, and the mass will self-receive after the stool, the pain relief. Physical examination: normal development, stable vital signs, normal heart and lung. The abdomen was soft, the liver and spleen did not touch the ribs, and the abdomen did not touch the mass. Rectal examination: Knee chest from the anus 3 ~ 1 ~ 7 points 5 × 4 × 4cm mass, the surface is uneven, broke into the intestine, no obvious tenderness, fingertips with blood. Laboratory tests were normal. Anal biopsy revealed malignant melanoma. After routine bowel preparation, abdominal meridotomy of malignant melanoma was performed. Resection specimen: black tumor