Final answer:
The most common peripheral artery aneurysms occur in the popliteal and femoral arteries, with the former being the most frequent. They are caused by weakening of the artery wall, leading to a bulge that requires prompt diagnosis and management.
Step-by-step explanation:
The two most common types of peripheral artery aneurysms are those that occur in the popliteal and femoral arteries. These aneurysms develop due to a weakening in the artery wall which can lead to a bulge or dilation. The popliteal artery, which runs behind the knee, is the site of the most frequently encountered aneurysms among the peripheral arteries, followed by the femoral artery, which runs through the thigh. Early diagnosis and management of these aneurysms are crucial to prevent complications such as rupture or thrombosis.