Neonatal management of unilateral hydronephrosis. Role for delayed intervention.

Hydronephrosis should be managed no differently in the newborn than in any other age group: UPJ obstruction should be surgically corrected as soon as the diagnosis is made. Unfortunately, the diagnosis of obstruction in the newborn with hydronephrosis is difficult and the traditional tests used in the older child or adult are not valid. Because newborn hydronephrosis is a relatively benign condition, surgical intervention should be delayed until the diagnosis of obstruction is proven. A protocol for evaluating the newborn with hydronephrosis is presented.