Supernumerary kidney

A supernumerary kidney is an additional kidney to the number usually present in an organism. This often develops as the result of splitting of the nephrogenic blastema, or from separate metanephric blastemas into which partially or completely reduplicated ureteral stalks enter to form separate capsulated kidneys; in some cases the separation of the reduplicated organ is incomplete (fused supernumerary kidney).

Less than a hundred cases are known of one or two supernumerary kidneys.

References

Luciano A. Favorito; Ana Raquel M. Morais (May–June 2012). "Evaluation of supernumerary kidney with fusion using magnetic resonance image". IBJU. 38 (3): 428–429. doi:10.1590/s1677-55382012000300018. PMID 22765860.

Congenital malformations and deformations of urinary system (Q60–Q64, 753)

Abdominal

Kidney	Renal agenesis/Potter sequence, Papillorenal syndrome cystic Polycystic kidney disease Meckel syndrome Multicystic dysplastic kidney Medullary sponge kidney Horseshoe kidney Renal ectopia Nephronophthisis Supernumerary kidney Dent's disease Alport syndrome

Ureter	Ectopic ureter Megaureter Duplicated ureter

Pelvic

Bladder	Bladder exstrophy

Urethra	Epispadias Hypospadias Posterior urethral valves

Vestigial

Urachus	Urachal cyst Urachal fistula

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Supernumerary kidney

See also

References