病例资料患者,女,74岁,因“间断腹痛、腹泻伴黏液血便20 d”入院。患者于20 d前开始出现下腹部隐痛不适,疼痛发作时有便意,排便后缓解,伴有腹泻,5~6次/d,量少,表面覆黏液及鲜血,有里急后重感、乏力及食欲减退,体质量无明显变化。查体:腹部平坦,腹肌软,无压痛及反跳痛,腹部未触及包块,肠鸣音正常。直肠指诊时在距肛门约8.0 cm处触及一约1.0 cm×1.0 cm大包块,质软;于胸膝 Case data, female, 74 years old, because of “intermittent abdominal pain, diarrhea with mucus bloody 20d ” admission. Patients began to have pain and discomfort of the lower abdomen 20 days before the onset of pain relief, bowel relief, accompanied by diarrhea, 5 to 6 times / d, the amount of less mucus and blood surface, with tenesmus, fatigue and loss of appetite No significant change in body weight. Physical examination: flat belly, abdominal muscle soft, no tenderness and rebound tenderness, abdomen not touched mass, bowel sounds normal. Rectal fingernail at the anus about 8.0 cm at the touch of a 1.0 cm × 1.0 cm mass, soft; in the chest and knee