title: Conversion from colonic conduit into recto-sigmoid pouch (Mainz pouch II).
abstract: OBJECTIVE
  To report our long-term results of conversion from conduit conversion into a continent anal urinary diversion, as after conduit urinary diversion in childhood, some patients wish to have a later conversion to a continent diversion to avoid external appliances and to improve their quality of life.
  
  
  METHODS
  Between 1992 and 2003, 139 patients had a urinary diversion with a recto-sigmoid pouch (Mainz pouch II), of whom four had a conversion from a colonic conduit diversion to a recto-sigmoid pouch. The mean (range) age at conduit diversion was 5.5 (3-14) years and the mean interval between conduit diversion and conversion to a continent anal diversion was 8 (4-18) years. The mean age at conversion into a Mainz pouch II was 13 (8-32) years and the follow-up afterward was 11.5 (1-13) years. The conversion was done by incorporating the pre-existing colonic conduit into the recto-sigmoid pouch with no ureteric reimplantation.
  
  
  RESULTS
  There were no early complications; one nephrectomy was required 5 years after conversion because of uretero-intestinal obstruction and pyelonephritis. All other reno-ureteric units remained stable and renal function was maintained. All patients are continent day and night; three require substitution with alkali at a base excess of < -2.5 mmol/L to prevent hyperchloraemia and acidosis.
  
  
  CONCLUSIONS
  The recto-sigmoid pouch is a therapeutic option when patients desire conversion from an incontinent type of urinary diversion to a continent type.
authors.affiliation: Department of Urology and Paediatric Urology, Johannes Gutenberg University, School of Medicine, Mainz, Germany.
authors.forename: Sascha
authors.initials: S
authors.lastname: Pahernik
authors.forename: Christoph
authors.initials: C
authors.lastname: Wiesner
authors.forename: Rolf
authors.initials: R
authors.lastname: Gillitzer
authors.forename: Raimund
authors.initials: R
authors.lastname: Stein
authors.forename: Joachim W
authors.initials: JW
authors.lastname: Thüroff
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D002675:Child, Preschool; D012809:Colon, Sigmoid / Q000601:surgery; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D017060:Patient Satisfaction; D011183:Postoperative Complications / Q000209:etiology; D012007:Rectum / Q000601:surgery; D012189:Retrospective Studies; D016896:Treatment Outcome; D001745:Urinary Bladder Diseases / Q000601:surgery*; D014547:Urinary Diversion / Q000379:methods*; D016476:Urinary Reservoirs, Continent