Between 1988 and 1993, 50 percutaneous antegrade endopyelotomies were performed for ureteropelvic junction obstruction at this institution. The success of the procedure was based on radiological parameters as well as patient symptomatology. The overall success rate of the procedure was 88%. Endopyelotomy was successful in 9 of 11 patients (82%) who presented after failing previous renal procedures. When endopyelotomy was used as the initial treatment modality the success rate was 90%. These results support the argument that endopyelotomy should be considered as first line therapy for most adults with ureteropelvic junction obstructions [corrected].

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