When a diagnosis of<unk>  kidney is made in utero by ultrasound, the disease is found to be bilateral in many cases. Those with bilateral disease often have other severe deformities or polysystemic malformation syndromes. In bilateral cases, the newborn has the classic characteristic of Potter's syndrome. The bilateral condition is incompatible with survival, as the contralateral system frequently is abnormal as well. Contralateral ureteropelvic junction obstruction is found in 3% to 12% of infants with<unk>  kidney and contralateral vesicoureteral reflux is seen even more often, in 18% to 43% of infants. Because the high incidence of reflux, voiding cystourethrography usually has been considered advisable in all newborns with a<unk>  kidney.
Multicystic dysplastic kidney
Renal segmental hypoplasia
Page kidney
Horseshoe kidney
Crossed renal ectopia
Ectopic kidney
Supernumerary kidney
Medullary sponge kidney