Late presentation stenosis of pyeloureteral junction

Abstract

Ureteropelvic junction (UPJ) obstruction is the most common cause of pediatric hydronephrosis. The typical presentation of hydronephrosis has changed since the widespread use of antenatal ultrasonography and nowadays diagnosis may be set before symptoms begin. We report five patients with late onset UPJ obstruction (three of them due to crossing renal vessels and two to intrinsic obstruction). Diminished renal function assessed by diuretic renogram could be appreciated in all hydronephrotic renal units. Improvement of renal function was observed after pyeloplasty in those with crossing vessels contrary to those with intrinsic UPJ obstruction.