Diverticulum of the urinary bladder.

Vesical diverticulum predominates in males and is frequently associated with obstruction at or near the bladder neck. The obstruction may be due to benign prostatic hypertrophy, urethral stricture or, less often, carcinoma. Diagnosis is made by intravenous or retrograde cystogram. Urinary stasis leads to recurrent infection and stone formation. While small diverticula may often be left alone, large ones should be surgically removed.