A 67-year-old man with acute popliteal arterial embolism has a negative cardiac echo for source of the thrombus. The following is/are true:

c. Emboli from popliteal aneurysms are often clinically silent

The most likely non-cardiac source of an arterial embolism is an infrarenal abdominal aortic aneurysm. Arterial embolism is more frequent from popliteal than femoral aneurysms, and these embolic events are often clinically silent. Subclavian artery aneurysms give rise to peripheral embolism in up to 33% of patients.