[Urinary undiversion].

As a novel item we present a case of the reconversion of a Bricker-Wallace type external urinary bypass into vesical replacement according to Camey technique type II. 5 years after radical cystectomy and external urinary bypassing due to a malignant infiltrating vesical carcinoma and considering the patient's malignant pathology controlled, we have converted this bypass into a bladder replacement with detubulized ileum. Renal function is preserved by means of a ileo-ileal intussusception mechanism, achieving mictional physiology and maintaining both daytime and nocturnal continence, thanks to the integrity of the external sphincter. The major advances in reconstructive urological surgery in recent years have enabled us to make a fresh study of these patients with bypasses, as in fact many of them are going to be able to be reconstructed.