Cases of true supernumerary kidney may be considered one of the rarest of all pathologic renal conditions. A very interesting and brief reference to this subject was given by Voigtel1 in 1805. He mentions cases reported by Blassius, Cruveilhier, Dupuytren, Eustachius, Gavard, Hyrtl and Haller. Voigtel, who reported the presence of four kidneys, also mentions a few writers, namely, Bottalus, Dellstang, Gemma and Schenk, who reported the presence of four kidneys.
The occurrence of accessory kidneys is not limited to man. Von Hansemann2 found an accessory kidney in a pig, and Pieth3 demonstrated the presence of a third kidney in a cow. This kidney was separate from the two ordinary kidneys, which were normal in position and structure.
Supernumerary kidney must be differentiated from cases of double kidneys. This form of anomaly is also very rare, but it is found more frequently than are cases of accessory
KRETSCHMER HL. SUPERNUMERARY KIDNEY. JAMA. 1915;LXV(17):1447–1448. doi:10.1001/jama.1915.02580170035009
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