患者，男性，70岁，1995年4月6日入院。患者腰腹部间歇性疼痛反复发作30年，多次经B超检查诊断为双肾结石。近3年除腰腹部疼痛外，常大便秘结。1994年11月因下腹部疼痛伴肛内胀坠麻木就诊。直肠指检在直肠后壁触及肿块，质地坚硬，表面光滑，轻度触痛，不能推移，但指套无血迹 Patient, male, 70 years old, admitted to hospital on April 6, 1995. Repeated onset of intermittent pain in the waist and abdomen for 30 years, multiple sonograms were diagnosed with double kidney stones. In addition to waist and abdominal pain in the past 3 years, often constipation. In November 1994, she presented with numbness due to pain in the lower abdomen and anal swelling. Rectal examination touched the mass in the posterior wall of the rectum, hard texture, smooth surface, mild tenderness, can not be changed, but the finger sleeve is bloodless