title: [Multiple tumors of the colon and rectum].
abstract: The possible occurrence of multiple synchronous or metachronous malignant lesions in patients with a carcinoma of the colon and rectum is a well known event. In this population-based study in the Geneva area from 1970 to 1986, the frequency of synchronous colorectal carcinomas was of 1.1% and that of metachronous carcinomas of 1%. The relative risk of metachronous colorectal carcinoma is higher than in the general population (colon after rectum 1.2, colon after colon 1.7 and rectum after rectum 1.4). A high association of adenomatous polyps with multiple colorectal carcinomas was observed. The 5-year actuarial survival in case of curative resection was of 87% for metachronous carcinomas, 35% for single carcinomas and 33% for synchronous carcinomas. We conclude that complete preoperative colonoscopy, whenever possible, should be performed to screen patients with synchronous carcinomas. Finally, a lifelong follow-up of the residual colon or rectum should be planned to detect metachronous lesions.
authors: Clinique de chirurgie digestive, Hôpital cantonal universitaire, Genève.
authors: C
authors: C
authors: Soravia
authors: R A
authors: RA
authors: Egeli
authors: M
authors: M
authors: Obradovic
authors: P
authors: P
authors: Ambrosetti
authors: M C
authors: MC
authors: Marti
authors: L
authors: L
authors: Raymond
authors: A
authors: A
authors: Rohner
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D003111:Colonic Polyps / Q000175:diagnosis / Q000473:pathology / Q000601:surgery*; D003113:Colonoscopy; D015179:Colorectal Neoplasms / Q000175:diagnosis / Q000473:pathology / Q000601:surgery*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009367:Neoplasm Staging; D009378:Neoplasms, Multiple Primary / Q000175:diagnosis / Q000473:pathology / Q000601:surgery*
vernacular_title: Les tumeurs multiples du côlon et du rectum.