What kind of tumors grow on the aorta?

Mostly sarcomas: While rare, tumors of aorta do occur in both thoracic and abdominal aorta with equal frequency.. Histologically, sarcomas constitute the majority of primary aortic tumors, with the malignant fibrous histiocytoma subtype being most common. They arise in the intima and grow along the intimal surface and into aortic lumen forming polypoid masses but tend to not invade the aortic wall.