大肠多原发癌和腺瘤是引起大肠癌术后复发的重要原因。大肠癌术前全结肠的肠镜检查、术后的肠镜随访、肠镜下积极治疗癌前病变——大肠腺癌,是提高大肠多原发癌的诊断和降低发生率的重要手段。 临床资料 1973～1991年共行结肠镜检查2600例,发现大肠癌163例(6.3％),其中大肠多原发癌22例(13.5％)。男13例,女9例。年龄18～20岁3例,29 Multiple primary colorectal cancers and adenomas are important causes of postoperative recurrence of colorectal cancer. Colonoscopy before colonoscopy for preoperative colorectal cancer, follow-up colonoscopic follow-up, and active treatment of precancerous lesions by colonoscopy, colorectal adenocarcinoma, are important means for improving the diagnosis and reducing the incidence of multiple primary colorectal cancers. Clinical data From 1973 to 1991, 2,600 colonoscopy were performed, and 163 colorectal cancers (6.3%) were found, including 22 cases (13.5%) of multiple primary colorectal cancers. 13 males and 9 females. 18 to 20 years old in 3 cases, 29