[Percutaneous endopyelotomy. Apropos of 27 cases].

27 percutaneous endopyélotomies were performed in 27 patients from February 1989 to January 1996 to treat 20 cases of congenital hydronephrosis and 7 cases of acquired stenosis. Strictures of uretero-pelvic junction were treated by electrocautery with postoperative drainage using a double J stent in 11 cases, or Redon drain in 16 cases. The evaluable results for 25 patients with a mean follow-up of 11 months showed an overall success rate of 80%. This technique is the treatment of choice for acquired stenosis and stage I and II congenital hydronephrosis (Cendron).