病例:女,85岁,因肛门肿块脱出5 h入院。入院当天,病人无明显诱因下突有排便感,之后发现肛门处肿块脱出,伴有鲜红色出血,出血量约100 mL。同时伴有中下腹部绞痛,疼痛未放射至其他部位,无发热、恶心、呕吐、晕厥等症状,自行回纳肿块失败后至我院急诊。追问病史,病人于一年前行肠镜发现直肠肿块,病理示“绒毛状腺瘤伴上皮中重度 Case: Female, 85 years old, due to anal mass 5h admission. On the day of admission, the patient had no obvious incentive to have a bowel movement, and after that he found an anus with a lump that was accompanied by bright red hemorrhage with a blood loss of about 100 mL. At the same time with abdominal pain in the lower abdomen, the pain did not radiate to other parts, no fever, nausea, vomiting, syncope and other symptoms, back to their own hospital after the failed mass to our emergency room. Asked history, the patient a year ago colonoscopy found rectal mass, pathology showed ”villous adenoma with epithelial moderate to severe