WHAT IS A BRAIN ANEURYSM?
A cerebral or brain aneurysm is a bulge or ballooning in an artery in the brain caused by weakness in the blood vessel wall.
Untreated brain aneurysms may have risk of rupture, resulting in what’s called hemorrhagic or cerebral stroke. The annual rate of rupture is approximately 8–10 per 100,000 people, or about 30,000 people in the United States.1,2
It is slightly more common in women than men, especially those who are in their late 40s to mid-50s. However, an aneurysm may occur at any age.3
Brain aneurysms are more common than you may think.
An estimated 1 in 50 people has a brain aneurysm.1,3
TYPES OF BRAIN ANEURYSMS
The types of brain aneurysms can be classified by both size and shape.4
ANEURYSM SIZE CLASSIFICATIONS
Small |
< 7 mm in diameter |
Medium |
7 – < 13 mm in diameter |
Large |
13–25 mm in diameter |
Giant |
> 25 mm in diameter |
ANEURYSM SHAPE CLASSIFICATIONS
Saccular aneurysm
Also known as “berry” aneurysms due to their round, sac-like shape, saccular aneurysms are the most common type, accounting for 80–90% of cases.1-3
Fusiform aneurysm
This aneurysm resembles an engorged blood vessel and can extend several centimeters in length. Fusiform aneurysms rarely rupture.1-3
Wide-necked aneurysm
A saccular aneurysm with a neck 4 mm wide, or twice as wide as the aneurysm is tall, is known as a wide-necked aneurysm.1,6
SYMPTOMS OF BRAIN ANEURYSM
In cases of small and unchanging brain aneurysms, there can be no symptoms. However, as an aneurysm grows larger, it can put pressure on surrounding tissues and nerves, causing neurologic symptoms sometimes called mass effect.1
Symptoms of UNRUPTURED ANEURYSMS include (but are not limited to):1
- Sudden and severe headache often described as “the worst headache of my life”
- Dilated pupils
- Blurred or double vision
- Pain above or behind the eye
- Weakness/numbness on one side of the face
- Difficulty speaking
- Nausea, vomiting
If not treated, a brain aneurysm can continue to expand and eventually rupture.1
CAUSES OF BRAIN ANEURYSM: ARE YOU AT RISK?
A brain aneurysm can result from a congenital defect, some inherited diseases, or other degenerative conditions, such as hypertension (high blood pressure) or atherosclerosis (fat buildup inside the arteries, often leading to heart attack or stroke). Other risk factors include cigarette smoking, cocaine use, blood vessel wall infection, and head trauma.1,3
There is no known way to prevent brain aneurysms.7
ANEURYSM FLOW DIVERSION
Flow diversion is a minimally invasive treatment option for brain aneurysms.8
LEARN MOREGETTING FLOW DIVERSION
Learn what to expect before, during, and after the flow diversion procedure.
READ ABOUT FLOW DIVERSION
3
Neurologic disorders (Chapter 3). In: Professional Guide to Diseases, 9th edn. Lippincott Williams & Wilkins, 2009.
4
Cerebral Aneurysms Fact Sheet, NINDS, Publication date May 2018. NIH Publication No. 18-NS-5506.
5
Becske, T. et al. Long-term clinical and Angiographic outcomes following Pipeline Embolization Device treatment of complex internal carotid artery aneurysms: Five-year results of the Pipeline for uncoilable or failed aneurysms trial. www.neurosurgery-online.com. Volume 80. January 2017.
6
Vallée JN, Pierot L, Bonafé A, et al. Endovascular treatment of intracranial wide-necked aneurysms using three-dimensional coils: Predictors of immediate anatomic and clinical results. Am J Neuroradiol. 2004;25(2):298–306.
7
Novitzke J. The basics of brain aneurysms: A guide for patients. J Vasc Interv Neurol. 2008;1(3):89–90.
8
Internal Report TR-NV11534/TR-NV11121. Rev. A