机体内存在两个或多个独立的恶性肿瘤之原发性多发性恶性肿瘤。本院从1971～1985年,15年间有四例大肠多发性癌,现将病例介绍并进行讨论。例一:女性,55岁,住院号102240,1971年3月6日入院。入院前一个月出现便频,里急后重,粘液血便,继而出现排便困难,便柱变细。检查浅部淋巴结无肿大,肝脾未扪及,腹部未触及肿块,肛门指诊于直肠后壁2.5cm处有一肿物,占肠管周径的1/2, There are two or more independent primary malignancies of malignant tumors in the body. In the hospital from 1971 to 1985, there were four cases of multiple colorectal cancers in 15 years. Cases are introduced and discussed. Example 1: Female, 55 years old, hospital number 102240, admitted to hospital on March 6, 1971. One month before admission, there was frequent frequency, tenesmus, bloody mucus, and then there was difficulty in defecation, and the column became thin. No enlargement of the superficial lymph nodes, no hepatosplenomegaly, no palpable masses on the abdomen, an anal finger was diagnosed on the posterior wall of the rectum and there was a tumor, accounting for 1/2 of the circumference of the bowel.