A rare case of positive prenatal intervention by early delivery for fetal hydronephrosis.

A male fetus followed for prenatal hydronephrosis thought to be bilateral ureteropelvic junction (UPJ) obstruction experienced severe acute oligohydramnios at 30 weeks gestation and was delivered at 32 weeks by Cesarean section. Postnatal bilateral UPJ obstruction was confirmed and anuria documented along with renal failure. Percutaneous nephrostomies were performed with reversal of the renal failure, and bilateral pyeloplasties were performed with a good outcome.