Tubulovillous adenoma of the anal canal: report of 2 rare cases with review of literature.

Adenomatous polyps of the colon are common lesions; however, involvement of anal canal by these lesions is extremely rare. Anal canal adenomas may rarely develop in the setting of familial adenomatous polyposis. Herein we describe 2 unique cases of tubulovillous adenoma of the anal canal with review of the literature. The diagnosis of these lesions is clinically important as they may undergo malignant transformation.