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Brain Aneurysm: Causes, Symptoms and Treatment

A brain aneurysm is an abnormal bulge in a cerebral artery wall. If it ruptures, it can be life-threatening. Early diagnosis and treatment are crucial for a good outcome.

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Things worth knowing about "Brain Aneurysm"

A brain aneurysm is an abnormal bulge in a cerebral artery wall. If it ruptures, it can be life-threatening. Early diagnosis and treatment are crucial for a good outcome.

What Is a Brain Aneurysm?

A brain aneurysm, also called a cerebral aneurysm or intracranial aneurysm, is an abnormal, balloon-like bulge that forms in the wall of an artery in or around the brain. It develops at a weakened point in the arterial wall and may grow over time. If the aneurysm ruptures, it causes bleeding into the space surrounding the brain, a life-threatening condition known as a subarachnoid hemorrhage (SAH).

Causes and Risk Factors

The exact cause of brain aneurysms is not always clear, but several factors increase the risk of developing one:

High blood pressure (hypertension): Persistent elevated blood pressure puts strain on artery walls, leading to weak spots.
Genetic predisposition: Brain aneurysms can run in families. Conditions like Marfan syndrome and polycystic kidney disease are associated with a higher risk.
Smoking: Tobacco use damages blood vessel walls significantly.
Age and sex: Aneurysms are more common in people over 40 and are more frequent in women.
Atherosclerosis: Hardening of the arteries weakens vessel walls.
Head trauma: In rare cases, a traumatic brain injury can lead to an aneurysm.
Infections: So-called mycotic aneurysms can form as a result of bacterial infections affecting the vessel wall.

Symptoms

Most brain aneurysms are asymptomatic -- meaning they cause no symptoms -- until they grow large enough or rupture. Symptoms vary depending on whether the aneurysm has ruptured:

Symptoms of an Unruptured Aneurysm (larger aneurysms)

Sudden, persistent headaches
Vision problems or double vision
Pain behind or around one eye
Numbness or weakness on one side of the face
Dilated pupil

Symptoms of a Ruptured Aneurysm (Subarachnoid Hemorrhage)

Thunderclap headache: A sudden, extremely severe headache often described as the worst headache of a person's life
Nausea and vomiting
Stiff neck
Sensitivity to light (photophobia)
Loss of consciousness or confusion
Seizures
Neurological deficits (e.g., paralysis, speech problems)

Important: A sudden, severe headache is a medical emergency. Call emergency services immediately!

Diagnosis

Brain aneurysms are diagnosed using imaging techniques:

Computed Tomography (CT): A fast initial scan, especially useful when a bleed is suspected.
CT Angiography (CTA): Uses contrast dye to visualize blood vessels in the brain in detail.
Magnetic Resonance Imaging (MRI) and MR Angiography (MRA): Provides detailed images without radiation; useful for monitoring known aneurysms.
Digital Subtraction Angiography (DSA): The gold standard for precise visualization; an invasive procedure using a catheter and contrast dye.
Lumbar Puncture (Spinal Tap): If a subarachnoid hemorrhage is suspected but the CT is negative, cerebrospinal fluid is tested for blood.

Treatment

Treatment depends on the size, location, and shape of the aneurysm, as well as the overall health of the patient. The two main treatment options are:

Surgical Clipping

Clipping involves opening the skull (craniotomy) and placing a small metal clip at the base of the aneurysm to seal it off from the blood supply. This method is highly effective and permanent.

Endovascular Coiling

Coiling (endovascular embolization) is a minimally invasive procedure in which a catheter is guided through the blood vessels to the aneurysm. Small platinum coils are then inserted to fill the aneurysm and promote clotting, blocking blood flow into it. This approach is increasingly preferred due to its lower invasiveness.

Watchful Waiting

Small, unruptured aneurysms with low rupture risk may be monitored over time with regular imaging -- especially when surgical risks outweigh the benefits. Blood pressure control and smoking cessation are essential accompanying measures.

Prognosis and Complications

The outlook for brain aneurysms depends largely on whether the aneurysm is treated before or after rupture. An unruptured aneurysm treated proactively generally carries a good prognosis. A ruptured aneurysm is a life-threatening emergency with high rates of mortality and long-term disability. Possible complications after rupture include:

Vasospasm (arterial spasm) with risk of stroke
Hydrocephalus (fluid buildup in the brain)
Cognitive impairment and neurological deficits
Re-bleeding (recurrent hemorrhage)

Prevention

While genetic factors cannot be controlled, the following measures can help reduce the risk:

Manage and monitor blood pressure consistently
Quit smoking or never start
Maintain a healthy diet and exercise regularly
Limit alcohol consumption
Consider screening if there is a family history of brain aneurysms

References

Rinkel GJ et al. - Prevalence and risk of rupture of intracranial aneurysms. Stroke. 1998;29(1):251-256. PubMed PMID: 9445359.
Lawton MT, Vates GE. - Subarachnoid Hemorrhage. New England Journal of Medicine. 2017;377(3):257-266.
World Health Organization (WHO) - Neurological Disorders: Public Health Challenges. Geneva: WHO Press, 2006.

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