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Fig. 3A. —31-year-old man with normal preaortic left renal vein with small posterior branch of left renal vein that is difficult to differentiate from lumbar vein or ascending lumbar vein. Venous phase anterior oblique volume-rendered 3D image shows normal preaortic left renal vein with small posterior branch of left renal vein (arrowheads) that is difficult to differentiate from lumbar vein or ascending lumbar vein. This small posterior branch was not opacified during late arterial phase (not shown) and opacified only during venous phase.