In utero diagnosis of severe oligohydramnios and fetal ureteral pelvic
outlet obstruction resulted in the placement of nephrostomy catheters
in two fetuses. The amniotic fluid index improved, mid-chest thoracic
circumference increased and renal calyceal dilation decreased in both
patients. Both neonates had evidence of pulmonary hypoplasia but surv
ived. This new technique offers an alternative for antenatal managemen
t of obstructive uropathy when the bladder is not accessible or is dis
tal to the site of the obstruction.