An aneurysm may occur anywhere in the body, although it typically forms in the aorta, brain, legs and spleen, as stated by Healthline. This medical condition is a more common occurrence in men than in women.
An aneurysm is a localized protrusion in a blood vessel due to weakening of the arterial wall. This abnormal enlargement may cause the blood vessel to rupture and trigger internal hemorrhaging, which could potentially prove fatal if not treated immediately.
Aneurysms that develop in the aorta near the heart are referred to as thoracic aortic aneurysms, while those that form in the stomach are called abdominal aortic aneurysms. Aneurysms may also occur in the popliteal artery behind the knee and in the mesenteric artery in the intestines, according to the Memorial Hermann Heart & Vascular Institute.