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Fig. 1A. —21-year-old man who presented with painful swelling of left leg. Lower back pain had started 10 days earlier. Axial contrast-enhanced CT scan obtained at level of upper poles of kidneys shows cluster of collateral veins (arrow) anterior to right kidney, whereas suprarenal segment of inferior vena cava is not seen. Two small accessory spleens are seen adjacent and medial to posterior edge of spleen.