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The term "solitary" or single kidney should be applied only to cases in which a single metanephros exists in the embryo. Cases in which the two kidneys have fused on one side of the body should not be included in the term solitary kidney. They are better described as cases of crossed ectopia, the ureter of the lower of the two fused kidneys crossing to end in the opposite side of the bladder. As a rule, the ureter of the true congenital single kidney ends on the same side of the bladder as that on which the kidney is situated. Clinically it is well, however, to remember that the ureter of the opposite side may be patent for a variable distance even though the kidney is absent, and also that the ureter of the single kidney may cross the median line of the body to end in the opposite side
Eisendrath DN, Wright F. ANURIA IN CONGENITAL SINGLE KIDNEY RELIEVED BY URETERAL CATHETERIZATION. JAMA. 1924;82(9):717. doi:10.1001/jama.1924.26520350004018c
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