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An ileal neobladder for total bladder replacement was created in 11 patients. To achieve a low pressure system, disruption of directional bowel peristalsis with a longitudinal incision at the antimesenteric border of a 70 cm. ileal segment is performed. A spherical pouch, the neobladder, is fashioned and anastomosed to the urethra. The ureters are implanted according to the method of Le Duc and Camey. Videourodynamic studies during various postoperative phases demonstrate this neobladder to be a urinary reservoir with a capacity approximating that of a normal bladder, good compliance during filling by maintaining pressure lower than 30 cm. water and no reflux. Of the 11 patients with the neobladder 8 are completely dry day and night, while 3 have grade I stress incontinence. All 11 patients had recognizable sensations of bladder distension closely simulating those of normal bladders. The use of this ileal neobladder in male patients undergoing radical cystectomy offers an alternative free of a stoma to urinary diversion, resulting in a highly compliant, low pressure bladder.