A popliteal artery aneurysm is a bulging (aneurysm) of the popliteal artery. People with popliteal aneurysms rarely have symptoms, and they are typically discovered during a routine physical examination. The cause of these aneurysms is unknown, but they are more common in older people and men and occur in both legs about 50% of the time. A popliteal artery aneurysm is a bulging (aneurysm) of the popliteal artery. People with popliteal aneurysms rarely have symptoms, and they are typically discovered during a routine physical examination. The cause of these aneurysms is unknown, but they are more common in older people and men and occur in both legs about 50% of the time. It is unclear whether stenting or open surgery is a better for those with aneurysms that are not causing symptoms.