原发性肛管直肠恶性黑色素瘤是较少见的恶性肿瘤,易误诊。自1857年Ｍｏｏｒｅ报道第一例以来,文献中报道的病例约500例[1],本文报告1例肛管直肠恶性黑色素细胞瘤,临床上被误诊为“直肠息肉”。患者男性,72岁,因腹泻2年,粘液脓血便伴包块脱出4个月,临床诊断为“直肠息肉”,而收? Primary anorectal malignant melanoma is a rare malignancy that is often misdiagnosed. Since Moore reported the first case in 1857, about 500 cases have been reported in the literature [1]. This article reports an anorectal malignant melanoma, which was clinically misdiagnosed as a “rectal polyp.” The patient was male, 72 years old. Due to diarrhea for 2 years, the mucous pus and blood were accompanied by prolapse of the mass for 4 months. The clinical diagnosis was rectal polyps.