患者男性，７６岁。因下腹隐痛伴大便次数增多０５个月，排便困难１０ｄ入院。查体：下腹部耻骨联合上方可及一１０ｃｍ×９ｃｍ大小质偏硬、表面不平、界不清的肿块，可稍推动，无压痛，肠鸣音正常。肛指检查：距肛缘７ｃｍ处可及直肠外肿块，质偏硬，包绕直肠１周而廖... Male patient, 76 years old. Due to lower abdominal pain with stool frequency increased 0  5 months, defecation 10d admission. Physical examination: the lower abdomen above the pubic symphysis can be a 10cm × 9cm size qualitative partial hard, uneven surface, unclear mass, can be slightly pushed, no tenderness, bowel sounds normal. Anal finger examination: 7cm away from the anal margin and can be rectal mass, qualitative hard, around the rectum for 1 week and Liao ...