Abstract
Perfusion pressure flow studies and diuretic radionuclide urography were used to evaluate 82 pediatric and adult patients with radiographic evidence of ureteropelvic junction obstruction to assess the significance of hydronephrosis, determine the indications for surgery, provide early postoperative results and define the criteria for nonoperative management. The role of these tests in the management of patients with suspected ureteropelvic junction obstruction is discussed.