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Inferior vena cava duplication and left renal aplasia: incidental findings?

Department of Radiology, National Defense Medical College, 3-2 Namiki, Tokorozawa, Saitama, 359-0042, Japan and Radiation Biology Branch, NCI/NIH, Building 10, Room B3 B69, Bethesda, MD 20892-1002, USA

View larger version (113K): [in this window] [in a new window]   Figure 1. Intravenous pyelography demonstrated the normal functioning right kidney and the non-functioning left kidney.

View larger version (52K): [in this window] [in a new window]   Figure 2. (a) At the level of the right kidney, contrast-enhanced CT shows that the right kidney (arrowheads) is large, but the left kidney is undetectable. Both right inferior vena cava (IVC; black arrow) and left IVC (white arrow) are identified. (b) At the level of the upper pole of the right kidney, contrast-enhanced CT shows that the left IVC (arrow) crosses anterior to the aorta and unites with the right IVC. The right accessory renal vein (arrowhead) is draining directly into the crossing left IVC.