Final answer:
An area of swelling or enlargement in a weakened arterial wall is called an aneurysm. Aneurysms can occur in any artery, but the most common location is in the aorta.
Step-by-step explanation:
An area of swelling or enlargement in a weakened arterial wall is called aneurysm. Aneurysms occur in weakened areas of the artery where the blood pressure causes the wall to bulge outward. They can develop in any artery, but the most common location is in the aorta, which is the largest artery in the body.