Only two cases of rectal giant inflammatory polyposis with ulcerative colitis have been reported in the English literature and both concern children. This is the first report of a case of localized giant inflammatory polyposis of the rectum in an adult with indeterminate colitis. A 71-year-old man underwent sigmoidectomy due to stenosis of the sigmoid colon. Final histological diagnosis was indeterminate colitis. Three years following the first operation, a rectal tumor with giant polyposis was observed, and abdominoperineal resection was performed. Macroscopic and microscopic examination indicated a localized giant inflammatory polyposis of the rectum.
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