[Villous adenoma of urinary bladder. Report of a new case].

We report on an 80-year-old female patient with a villous polyp of the bladder. We believe this lesion may correspond to an intermediate stage in the well known sequence of injury-metaplasia-dysplasia-carcinoma of the large intestine. Intestinal metaplasia in the bladder is a potentially malignant lesion. If villous adenomas are diagnosed early, before malignant transformation, simple excision can achieve cure.