URETEROPELVIC JUNCTION OBSTRUCTION IN INFANTS MIMICKING URETEROVESICAL JUNCTION OBSTRUCTION ON SONOGRAPHY

We present two infants with ureteropelvic junction obstruction with ve ry large renal pelves, which extended to the level of the urinary blad der. In both cases, the distal aspect of the renal pelvis simulated a dilated distal ureter, leading to the incorrect sonographic diagnosis of ureterovesical junction obstruction. Awareness of this potential pi tfall on sonography is important when imaging infants with prenatal di agnosis of hydronephrosis.