[Importance of endoscopic follow-up in the diagnosis of metachronous colorectal cancer].

Between 1976 and December 1992 a total of 748 patients with colorectal cancer were observed at the Surgical Clinic of Pisa University; in 9 of these a second colorectal tumour appeared between 30 months and 18 years after the original tumor. Coloscopy is the treatment of choice for evaluating the colon operated due to cancer since it allows an early diagnosis of any metachronous tumours, reveals synchronous tumours which have been overlooked prior to the operation and performs a therapeutic and prophylactic function in terms of the endoscopic removal of adenomatous polyps which have appeared in the meantime.