supernumerary kidney

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su·per·nu·mer·ar·y kid·ney

a kidney, in addition to the two usually present, developed from the splitting of the nephrogenic blastema or from a separate metanephric blastema, into which a partial or complete duplication of the ureteral stalk enters to form a separate, capsulated kidney; in some cases, the separation of the duplicated organ is incomplete.
Farlex Partner Medical Dictionary © Farlex 2012
References in periodicals archive ?
Fused supernumerary kidney. radiology case reports 2011;6(4):1-4.
(3.) Koureas AP, Panourgias EC, Gouliamos AD, Trakadas SJ; Vlahos LJ; Imaging of supernumerary kidney. Eur Radiol.2000; 10:1722-3.
The histological examination demostrated that this case, presenting two different complete collecting systems differentiated by a own capsule, can be considered a supernumerary kidney. CT scans and MRIs performed preoperatively failed to differentiate the diagnosis with a duplicate collecting system in a simple kidney.