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Cerebral Aneurysm

Cerebral Aneurysm

Alternate Names

  • brain aneurysm
  • Cerebral aneurysm


A cerebral aneurysm is an abnormal swelling of a blood vessel wall inside the brain.

What is going on in the body?

A cerebral aneurysm is an area where the elastic layer in the wall of a a blood vessel in the brain has weakened. As a result, the vessel wall balloons out. Aneurysms usually form where arteries branch, because the vessel wall is weaker at this point Over time, the aneurysm may balloon and thin the wall so much that it ruptures.


What are the causes and risks of the condition?

Aneurysms are often congenital, that is, present from birth. Other times, the development of a cerebral aneurysm may result from a combination of factors including high blood pressure, smoking, and arteriosclerosis (aka hardening of the arteries).
As the person gets older, aneurysms grow.. An individual with a family history of cerebral aneurysm is at a slightly higher risk, and debate continues regarding whether it is useful to screen individuals who have a close relative with this disorder.
Although rare, sometimes an aneurysm can be caused by sepsis, an infection in the blood. The bacteria can lodge in the vessel wall and weaken it. A condition known as polycystic kidney disease is associated with an increased risk of cerebral aneurysm, as is Ehlers-Danlos syndrome, an inherited disorder of abnormal collagen production.


What can be done to prevent the condition?

Currently, studies suggest that risk of a cerebral aneurysm may be reduced by carefully controlling high blood pressure, avoiding smoking tobacco, and following a diet low in cholesterol. In addition, screening family members of an individual with cerebral aneurysm for this disorder may be appropriate under some circumstances.


How is the condition diagnosed?

Usually if discovered prior to rupture, a cerebral aneurysm is an incidental finding on MRI or MRA (an MRI study of the arteries of the brain) which was done to evaluate an unrelated problem.
Occasionally, an aneurysm is large enough or is in a place that will cause symptoms such as headache, visual disturbances, or symptoms referable to the pituitary gland. In this instance, the neurological examination may be abnormal, leading the clinician to order a brain MRI and/or MRA, on which the aneurysm can be seen.

Long Term Effects

What are the long-term effects of the condition?

There may be no long-term effects for an individual with an unruptured cerebral aneurysm. However, rupture of a cerebral aneurysm is a critical event often resulting in death the person can reach the hospital. The overall risk of death is 45% within a month after the rupture, with half of the survivors having significant brain damage.

Other Risks

What are the risks to others?

A cerebral aneurysm poses no risk to others.


What are the treatments for the condition?

The best treatment for an aneurysm varies from person to person. Surgery to repair the aneurysm is quite risky in itself. The American Heart Association, called the AHA, has issued guidelines for treatment of unruptured aneurysms. The AHA guidelines advise the healthcare professional to look at three factors when choosing the treatment plan:
  • the size of the aneurysm
  • the person's age
  • the person's life expectancy
For older persons with an unruptured aneurysm, the AHA guidelines recommend to wait and watch. The aneurysm can be monitored with regular cranial CT scans or cranial MRIs.
Younger people are usually good candidates for surgery. A craniotomy is a type of brain surgery that is used to repair an aneurysm. With the most common type, a metal clip is used to close off the aneurysm at its base. Medicines may be used to control high blood pressure or to treat problems with blood clotting.

Side Effects

What are the side effects of the treatments?

Side effects vary, depending on the treatment chosen. Medicines can cause allergic reactions and problems with blood clotting. Surgery can be complicated by bleeding, infection, or a reaction to the anesthesia. Even if the person survives surgery, he or she can sometimes be left with permanent disabilities resulting from a brain injury incurred during surgery.

After Treatment

What happens after treatment for the condition?

A person with significant disabilities may need rehabilitation therapy on a long-term basis. This may include speech therapy, occupational therapy, and physical therapy.


How is the condition monitored?

If the aneurysm was successfully removed surgically, a person may not need any more monitoring. However, someone who has major disabilities either from surgery or after surviving the rupture of an aneurysm may need frequent visits to the healthcare professional. Any new or worsening symptoms should be reported.

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