Diuretic radionuclide urography: functional assessment following pyeloplasty.

The radiographic appearance of the hydronephrotic upper urinary tract due to congenital ureteropelvic junction obstruction may not return to normal even though the obstruction is relieved by surgical repair. We present a case of ureteropelvic junction obstruction in which the success of the repair was demonstrated dramatically only by diuretic radionuclide urography.