Abstract
This report describes an adenocarcinoma arising in the perineum 30 years after two-stage total proctocolectomy for ulcerative colitis. This is one of the longest intervals reported between resection and presentation with cancer and also the only case in which the tumor is clearly free of association with existing bowel. The mass originally presented as a perineal mucocele, an unusual complication of proctocolectomy for ulcerative colitis, and this is the first such mucocele to demonstrate malignant transformation.
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