Intracranial Aneurysm

10 out of every 10,000 may suffer from a cerebral aneurysm in their lives. Although it’s asymptomatic, this vascular condition has some risk factors that you should keep in mind.
Intracranial Aneurysm
Valeria Sabater

Written and verified by the psychologist Valeria Sabater.

Last update: 15 November, 2021

An intracranial aneurysm is a dilation of a brain artery wall. The most challenging aspect of these vascular conditions is that they tend to present no symptoms. So little by little, and without the affected person noticing it, this area grows into a bump, which may end up bursting. If you don’t act quickly in such a case, the consequences can be fatal.

Most of you know a person who’s been in this delicate situation. There are people who, thanks to early detection, have benefitted from quick intervention. One classic example of such an intervention is embolization. People who are helped by early detection may be able to continue their normal lives without significant consequences. Other patients, on the other hand, have to live with the effects of a ruptured aneurysm.

Whatever the case may be, there is one piece of information that you shouldn’t forget. This is a condition that tends to appear most commonly between the ages of 40 and 65. Nevertheless, it can also affect young people and even children. Sometimes, certain genetic problems or arteriovenous malformations can result in these dangerous arterial changes in the brain.

Intracranial aneurysms can affect anyone regardless of age. However, they’re more common in people who’re over 40 years of age. They also tend to affect more women than men.

An intracranial aneurysm in the brain blown up.

What’s an intracranial aneurysm?

An intracranial aneurysm is a vascular alteration that can appear in an artery or a vein in the brain. The blood flow accumulates in a segment and this ends up causing a blood vessel dilation. This vessel then expands in the shape of a bubble.

A study undertaken by the Department of Surgery of the College of Medicine of the University of Oklahoma explains that almost 85% of aneurysms are located in nearly the same place. They are usually located right at the base of the brain. This is precisely the location of the circle of Willis.

Depending on the shape, size, and location, it’s possible for you to be able to distinguish between three types of intracranial aneurysms:

  • Saccular or “berry” aneurysms. Appear on artery walls. They aren’t congenital and they develop throughout your life. These are the most common types.
  • Fusiform aneurysms. These are much more difficult to detect and treat. Instead of having the shape of a bubble, they tend to affect a large part of the brain artery, causing thrombosis.
  • Desiccant aneurysms. This typology is less common and affects younger people. They can be caused by hereditary problems, infections, arthritis, fibromuscular dysplasia, and atherosclerosis, among others.

What are the symptoms of an intracranial aneurysm?

Just as we indicated in the beginning, it’s common for an intracranial aneurysm to be asymptomatic. That being said, they’ll manifest some symptoms if they rupture. That’s when you should act quickly. Keep the following clues in mind. They may indicate that you’re suffering from an aneurysm:

  • Sudden severe headache. Many people describe it as the worst migraine of their lives. It’s intense and paralyzing, causing rigidity in the neck, tearing in one eye, and even paralysis in one eye.
  • Likewise, vomiting and dizziness are common.
  • Sensitivity to light.
  • Coordination and movement problems.
  • Difficulty thinking clearly.
  • Speaking disorders (aphasia).
  • Loss of consciousness.

Diagnosing an intracranial aneurysm

Doctors have different scales for evaluating the severity of an intracranial aneurysm. The most common of these are the Glasgow scale (if the person has lost consciousness) and the Hunt and Hess scale. In the latter, the doctor will assess the following:

  • Degree of headache and neck rigidity.
  • Sleepiness and degree of mental confusion.
  • Presentation of hemiparesis (paralysis on one side of the face or body) or lack of it.
  • A coma, the state of greatest severity and worst prognosis.

If you have a family history of the condition, experts recommend that you get checkups and diagnostic examinations. The most common way to identify the presence of an intracranial aneurysm before it bursts is through the following:

  • A CT scan.
  • A brain angiography.

On the other hand, there’s some good news about this condition. There are many people who go through life without ever knowing they have a brain aneurysm. In other words, not all of these cerebrovascular alterations end up in a rupture. The probability isn’t very high. Nevertheless, there’s always a risk that it can happen.


When treating an intracranial aneurysm, you have to keep a lot of factors in mind. The first is to consider whether or not it’s already ruptured.

Factors on the second level are the size of the aneurysm, its location, the age of the patient, and whether the patient has other neurological conditions. Nevertheless, the good news is that when a doctor has detected the condition early on, treatments can be effective. Additionally, the surgery required to treat it usually isn’t very difficult. An endovascular approach is often enough. These are the most common types:

Endovascular embolization

This procedure consists in introducing a small catheter through the patient’s groin and then following the brain artery all the way to the brain. Once there, the surgeon blocks the aneurysm.

For this, the surgeon will use stents, which are devices that control and channel these pathologies.

Cerebral bypass

Man with a headache due to intracranial aneurysm.

A cerebral bypass requires that the patient stay in the hospital between 3 to 5 days. For this procedure, the intervention is a bit more complicated than the embolization. That’s because it requires undertaking a small craniotomy in order to apply that bypass. The end goal is for the bypass to regulate and reduce the abnormal blood flow to that vein or artery.

Surgical blocking procedure

Finally, for the most severe of cases, the doctors may opt for an intervention that involves an incision in the skull. That being said, the entry time is short and the intervention is simple. Some titanium devices are inserted in order to channel and treat the aneurysm.

Whatever the case may be, all of these treatments are highly effective when the aneurysm hasn’t ruptured. It’s clear that you may not always be so lucky. You may not always be aware of their existence because they’re asymptomatic. Nevertheless, it’s important to keep this information in mind in order to be ready and know how to act in case they affect you.

All cited sources were thoroughly reviewed by our team to ensure their quality, reliability, currency, and validity. The bibliography of this article was considered reliable and of academic or scientific accuracy.

This text is provided for informational purposes only and does not replace consultation with a professional. If in doubt, consult your specialist.