[Percutaneous endopyelotomy].

Endourologic treatment of the ureteropelvic junction syndrome was performed 48 times in 45 patients (1 was bilateral, and 2 required repeat treatment) via a percutaneous incision of the stenosis, and placement of a modelling double-J catheter, which was left indwelling for 4 to 6 weeks. Evaluation of the results between 6 months and 3 years revealed a success rate of 81.5% for secondary stenosis and 73.7% for congenital stenosis. If the foregoing technique fails, pyeloplasty can be performed without difficulty.