Pathological dilation or protrusion of the wall of a blood vessel, most often an artery, which occurs due to a weakening of its structure. Aneurysms can form in various parts of the body, including the brain, aorta, and other vessels.
The main danger of an aneurysm is the risk of it rupturing, which can lead to internal bleeding, tissue damage, and life-threatening conditions such as stroke or bleeding in the abdomen. Treatment depends on the size, location, and risk of complications and may include drug therapy or surgery.