Colonic metaplasia with colonic-type polyps on an ileostomy stoma in polyposis coli. Report of a case.

A unique case is reported in which chronic physical and chemical irritation of an ileostomy stoma (after proctocolectomy for polyposis coli) was associated with colonic metaplasia and formation of colonic-type tubular adenomas on the external surface of the ileostomy. The remainder of the terminal ileum and the upper gastrointestinal tract were normal, with no evidence of Gardner's syndrome. This case demonstrates that even metaplastic colonic epithelium is susceptible to the formation of adenomas in polyposis coli patients.