Angiomyolipoma of the kidney with extension into the inferior vena cava.

Renal angiomyolipoma is a benign, nonaggressive hamartoma which rarely invades the vascular system. A case of angiomyolipoma of the right kidney with extension into the inferior vena cava, detected by ultrasonography, computed tomography (CT scanning), and magnetic resonance imaging (MRI) is presented. This tumor was found incidentally in a 31-year-old female who underwent CT scanning for unrelated abdominal problems. To our knowledge, only eight cases of angiomyolipoma with caval involvement have been reported in the world medical literature.