Unilateral Duplicated System: Comparative Length and Function of the Kidneys

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Objective:The objective of this study was to estimate kidney length and function in patients with unilateral duplex kidney.Materials and Methods:Thirteen patients with a unilateral duplicated system were reviewed retrospectively. The length of the kidneys was measured by ultrasound, and the relative function of the kidneys was estimated by renal scan.Results:In all patients, the duplex kidney was the left one. The length of the right kidney on the renal ultrasound growth chart was from –1.5 to +0.4 standard deviations from the mean for age, and the left kidney length was from –0.5 to +4.3 standard deviations from the mean. On renal scans the kidneys with a duplicated system contributed 51 to 67% to total renal function; the contralateral ones, 33 to 49%.Conclusions:Kidneys with a duplicated system may be larger than their counterparts and they may contribute more to total renal function. When a disparity in length between the 2 kidneys is encountered, 1 of the possibilities that should be taken into account is a unilateral duplicated system.

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