Renal sinus angiomyolipoma.

The first case of an angiomyolipoma limited to the renal sinus is presented. The radiographic findings were a relatively lucent mass within the renal sinus (extrarenal); neovascularity that did not respond to epinephrine; lack of arteriovenous shunting; a "whorled" venous pattern; and displacement and compression of the renal vein without evidence of invasion. Infusion nephrotomography and renal venography were crucial in the localization and preoperative suggestion of this benign renal sinus lesion. The renal sinus angiomyolipoma was removed by blunt dissection and the kidney preserved.