Of congenital renal anomalies, the unilateral fused kidney is probably the rarest. Hunter,1 in 1785, presented the first authentic case, and since then scattered reports appeared in the literature, which were reviewed by Stein.2 The rarity of the condition may be surmised from the fact that of thirty-four renal anomalies found by Stewart and Lodge 3 in 6,500 necropsies, only one unilateral fused kidney was encountered. Morris,4 in 15,908 necropsies, also found only one case.
The greatest majority of the unilateral fused kidneys were discovered on necropsy, the patients having died from some other causes, while in a few instances the condition was found on the operating table. Colmers 5 was the first to recognize the anomaly in a living patient by double ureteral catheterization and pyelography. Since then five more cases were reported by Stein 6 (one case); Bugbee and Losee7 (two cases), and, more
DOURMASHKIN RL. THE UNILATERAL FUSED KIDNEY: REPORT OF CASE. JAMA. 1924;82(25):2025–2027. doi:10.1001/jama.1924.02650510025008
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