Distribution of colonic polyps: increased incidence of proximal lesions in older patients.

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Abstract
Several recent studies have shown a proximal shift in the distribution of colonic carcinoma compared to older studies. Because of the association between polyps and cancer, the authors evaluated the distribution of colonic polypsin 3664 consecutive patients who had a colon examination over a period of 14 mo. A total of 967 colorectal polyps were found in 633 patients. In all, 502 polyps (52%) were proximal to the rectosigmoid. Older patients had significantly more right-sided polyps and fewer rectosigmoid lesions. Large polyps occurred more frequently in the right colon, and this was also statistically significant. Gender had no effect on polyp distribution. The importance of screening for polyps, particularly on the right side of the colon apparently increases with age.