<unk>  is defined as an atypically placed kidney due to faulty migration from the fetal pelvis during embryologic development.<unk>  kidney may be abdominal, lumbar or pelvic, based on its position in the retroperitoneum. It can be placed either ipsilaterally or contralaterally, when it is called crossed<unk> .
Renal ectopia
Horseshoe kidney
Supernumerary kidney
Multicystic dysplastic kidney
Renal agenesis
Posterior urethral valves
Medullary sponge kidney
Cryptorchidism