Villous adenoma of the urinary bladder.

Villous adenomas arising in the urinary tract are an uncommon occurrence. They have been identified in the urachus, urethra, prostate, and throughout the bladder. Villous adenomas arising in the bladder are rare tumors that have been described as isolated cases and a few case series. We report a new case of a large villous adenoma arising in the bladder that was treated by transurethral resection.