本文对1976～1986年10年间565例下消化道出血患者的纤维结肠镜检查结果进行分析.病因检出率95.58%,以慢性结肠炎最多(44.96%),其次为结肠息内(23.19%)、结肠癌及溃疡性结肠炎等.本组绒毛状腺瘤癌变率41.67%,管状腺瘤癌变率8.16%,前者为后者的5.11倍。对年龄40岁以上,出血时间半年以内者,应警惕结肠癌的可能,特别对有脓血便的患者,应及时作有关检查。 This paper analyzed the results of colonoscopy in 565 patients with lower gastrointestinal bleeding during the 10 years from 1976 to 1986. The detection rate of etiology was 95.58%, with chronic colitis being the highest (44.96%), followed by colonic polyposis (23.19%). Colon cancer and ulcerative colitis, etc. The malignant transformation rate of villous adenoma in this group was 41.67%, and the cancerous rate of tubular adenoma was 8.16%. The former was 5.11 times that of the latter. For those who are over 40 years of age and bleeding time is less than half a year, they should be alert to the possibility of colon cancer, especially for patients with pus and bloody stools.