<unk> , also known as ren arcuatus (in Latin), renal fusion or super kidney, is a congenital disorder affecting about 1 in 500 people that is more common in men, often asymptomatic, and usually diagnosed incidentally. In this disorder, the patient's kidneys fuse to form a<unk> -shape during development in the womb. The fused part is the isthmus of the<unk> . The abnormal anatomy can affect kidney drainage resulting in increased frequency of kidney stones and urinary tract infections as well as increase risk of certain renal cancers. Fusion abnormalities of the kidney can be categorized into two groups:<unk>  and crossed fused ectopia. The<unk> ' is the most common renal fusion anomaly.
Horseshoe kidney
Page kidney
Multicystic dysplastic kidney
Ectopic kidney
Crossed renal ectopia
Supernumerary kidney
Medullary sponge kidney
Renal segmental hypoplasia