Newborn with oligohydramnios and hydroureteronephrosis on prenatal US

US of cystic renal dysplasia
Sagittal US of the kidneys (above) show small echogenic kidneys bilaterally with some cysts but no hydronephrosis. AP image from a VCUG (below left) shows bilateral grade 4 vesicoureteral reflux with intrarenal reflux and the bladder is trabeculated. Lateral image from the VCUG (below right) shows a urachal diverticulum arising from the dome of the bladder anteriorly. The urethra was normal.

The diagnosis was vesicoureteral reflux causing cystic renal dysplasia and an incidental urachal remnant.