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Background: Management of malignant renal tumors involving the inferior vena cava (IVC) depends on tumor extension within the cava.Methods: Of 295 patients treated for renal cancer, propagation of tumor mass through the renal vein to IVC was seen in 22 (7%) patients. Cephalad extension of the tumor was suprarenal: infrahepatic in 12, retrohepatic in 6, and within the right atrium in 4 patients. All...