Which of the following statements about thrombo-obliterative disease of the aorta and its branches are correct?

B. Atherosclerosis is the most common pathologic cause of arterial obstruction.

C. Lesions occur with greater frequency at the origin of vessels from the aorta. 

DISCUSSION: Thrombo-obliterative disease of the aorta and its branches is primarily due to atherosclerosis. The lesions occur most frequently at the origin of blood vessels and are usually localized and short. Surgical management consists primarily of bypass grafts since endarterectomy is often followed by later reocclusion with reappearance of symptoms.