Renal oncocytoma: angiographic features of two cases.

Two cases of renal oncocytoma (proximal tubular adenoma) with a similar angiographic appearance are reported. The vascular supply to the lesion tends to be arranged in "spoke-wheel" pattern with vessels radiating toward the center of the lesion; the angiographic appearance may help to differentiate renal oncocytoma from hypernephroma preoperatively.