[Inverted papilloma of the urinary bladder].

Five cases of inverted papilloma in the bladder are reported. All cases were males complaining of dysuria or hematuria. Total cystectomy with construction of ileal conduit was carried out in the first case, and transurethral resection in the other cases. Every surgical specimen was histologically diagnosed as inverted papilloma. The inverted papilloma is a distinct lesion characterized by its rarity compared to frequency of the other vesical papillomas. The prognosis is generally benign, but the possibility of recurrence and malignant transformation indicates the necessity of a close periodical follow-up.