Routine second trimester ultrasound screening has resulted in more infants diagnosed with
antenatal hydronephrosis. Current recommendations suggest postnatal evaluation of all
infants with a renal pelvic diameter> 5 mm with ultrasound and voiding cystourethrogram
(VCUG.) There are many etiologies of obstructive uropathy including ureteropelvic junction
(UPJ) obstruction, ureterovesical junction (UVJ) obstruction, posterior urethral valves (PUV),
prune belly syndrome, and vesicoureteral reflux (VUR). Obstructive uropathy can result in …