Aneurysm

Definition

An aneurysm is an abnormal widening or ballooning of a portion of an artery, related to weakness in the wall of the blood vessel. Some common locations for aneurysms include:

• Aorta (the major artery from the heart) - see abdominal aortic aneurysm and thoracic aortic aneurysm)
• Brain (cerebral aneurysm)
• Leg (popliteal artery aneurysm)
• Intestine (mesenteric artery aneurysm)
• Splenic artery aneurysm

Causes, incidence, and risk factors

Aneurysms are either congenital (present before birth) or acquired. It is not clear exactly what causes aneurysms. Defects in some of the components of the artery wall may be responsible. In certain cases (abdominal aortic aneurysms), High blood pressure is thought to be a contributing factor.

Atherosclerotic disease (cholesterol buildup in arteries) may contribute to the formation of certain types of aneurysms. Pregnancy is often associated with the formation and rupture of aneurysms of the splenic artery (an artery leading to the spleen).

Symptoms

The symptoms vary depending on the location of the aneurysm. Swelling with a throbbing mass at the site of an aneurysm is often seen if it occurs near the body surface. Aneurysms within the body or brain often have no symptoms

In the case of rupture, Low Blood pressure, high heart rate, and lightheadedness may occur. The risk of death after a rupture is high.

Signs and tests

Physical exam, ultrasound examination, and CT scan are used to evaluate aneurysms.

Treatment

Surgery is generally recommended. The timing and indications for surgery differ depending on the type of aneurysm.

Some people are candidates for stent placement. This procedure involves the use of a tube placed inside the vessel and can be performed without an incision, with specialized catheters that are introduced through arteries at the groin. This is called an endovascular repair, a new technique, which should only be performed by experienced physicians. Not all patients with aneurysms are candidates for stenting, however.

Expectations (prognosis)

With successful surgical repair, the outlook is often excellent.

Complications

The main complications of aneurysm include rupture, infection, and compression of local structures. Rupture of some types of aneurysms can cause massive bleeding, which is often fatal. This is commonly seen with abdominal aortic aneurysms, mesenteric artery aneurysms, and splenic artery aneurysms.