Renal pelvis flap--guide for ureteral spatulation and handling during dismembered pyeloplasty.

Introduction: To present a technical modification of the classic dismembered pyeloplasty technique. We have implemented it in 112 pyeloplasties performed during the past 15 years.

Technical Considerations: The technical modification is based on a renal pelvis flap kept undetached from the ureteropelvic junction, and consequently from the ureter, until near completion of the new ureteropelvic anastomosis.