<unk>  is the congenital disorder of<unk> s in which the isthmus of both<unk> s fuse together during embryonic development leading to appearance of<unk> ". It is the most common fusion defect of<unk> s.
Horseshoe kidney
Multicystic dysplastic kidney
Supernumerary kidney
Medullary sponge kidney
Renal ectopia
Renal agenesis
Medullary cystic kidney disease
Polycystic kidney disease 2