Angiomyolipomas are benign renal tumors composed of fat, smooth muscle, and blood vessels. They are strongly associated with tuberous sclerosis and may be multiple and bilateral in these patients. While RCC may occur, angiomyolipomas are much more characteristic.

According to Rumack’s Diagnostic Ultrasound:

“Angiomyolipomas are frequently multiple and bilateral in patients with tuberous sclerosis.”