Supernumerary kidney

Additional kidney present in an organism

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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.

## See also

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* Supernumerary body part

## References

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* 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.

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Congenital malformations and deformations of urinary system

Abdominal|

| Kidney|

* Renal agenesis
* Renal hypoplasia
* Potter sequence
* Papillorenal syndrome

* cystic
* Polycystic kidney disease
* Meckel syndrome
* Multicystic dysplastic kidney
* Medullary sponge kidney

* Horseshoe kidney
* Renal ectopia
* Nephronophthisis
* Supernumerary kidney
* Pelvic kidney

* Dent's disease
* Alport syndrome

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Ureter|

* Ectopic ureter
* Megaureter
* Duplicated ureter

Pelvic|

| Bladder|

* Bladder exstrophy

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Urethra|

* Epispadias
* Hypospadias
* Posterior urethral valves
* Penoscrotal transposition

Both|

* Prune belly syndrome

Vestigial|

| Urachus|

* Urachal cyst
* Urachal fistula
* Urachal sinus

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