Brain Aneurysm Embolization (Endovascular Coiling)

Endovascular coiling is an advanced treatment for cerebral aneurysms that does not require open brain surgery. During the procedure, a neurointerventional specialist guides a thin catheter through an artery, usually from the groin or wrist, toward the blood vessels of the brain.

Tiny platinum coils are then placed inside the brain aneurysm. These coils promote clot formation and help isolate the aneurysm from the normal circulation.

Depending on the aneurysm's size, location, shape, and neck width, treatment may also involve stent-assisted coiling, balloon-assisted coiling, or flow diversion.

A brain aneurysm is a weakened area in the wall of a cerebral artery that forms a bulge filled with blood. Some brain aneurysms remain small and cause no symptoms, while others may grow and increase the risk of rupture.

When a brain aneurysm ruptures, it can cause bleeding around the brain, known as subarachnoid hemorrhage. This is a serious medical emergency that requires urgent diagnosis and treatment.

Brain aneurysm embolization is a minimally invasive endovascular procedure designed to treat the aneurysm from inside the blood vessel. Unlike open surgical clipping, endovascular coiling is performed without opening the skull.

During cerebral aneurysm embolization, a catheter is carefully advanced through the vascular system until it reaches the aneurysm. Soft platinum coils are then inserted into the aneurysm sac.

The coils slow blood flow and promote clot formation inside the aneurysm, helping prevent further circulation within it.

Brain aneurysm treatment planning depends on several factors, including:

• Size of the aneurysm

• Location of the aneurysm

• Shape and neck width

• Whether the aneurysm has ruptured

• Patient age and overall condition

• Relationship to nearby cerebral arteries

• Previous bleeding

• Estimated risk of future rupture

For complex brain aneurysms, additional endovascular devices may be required.

Brain Aneurysm Symptoms and Causes

Symptoms of an Unruptured Brain Aneurysm

Many unruptured brain aneurysms do not cause symptoms and may be discovered incidentally during CT or MRI imaging.

Possible symptoms include:

• Persistent or localized headache

• Pain behind or around the eye

• Blurred vision

• Double vision

• Drooping eyelid

• Dilated pupil

• Facial numbness

• Facial weakness

• Difficulty moving the eyes

• Neurological symptoms caused by pressure on nearby nerves

Symptoms of a Ruptured Brain Aneurysm

A ruptured brain aneurysm requires immediate emergency medical attention.

Symptoms may include:

• Sudden severe headache

• Nausea and vomiting

• Neck stiffness

• Loss of consciousness

• Seizures

• Confusion

• Sensitivity to light

• Weakness or numbness

• Difficulty speaking

• Vision changes

Causes and Risk Factors

Brain aneurysms may develop because of weakness in the wall of a cerebral artery.

Risk factors may include:

• High blood pressure

• Smoking

• Increasing age

• Family history of brain aneurysm

• Certain inherited connective tissue disorders

• Polycystic kidney disease

• Abnormal blood vessel development

• Previous history of intracranial aneurysm

Having one or more risk factors does not necessarily mean that a brain aneurysm will develop or rupture.

Brain Aneurysm Diagnosis and Treatment

Diagnosis

Accurate imaging is essential before selecting the appropriate brain aneurysm treatment.

Common diagnostic tests include:

CT Scan

A CT scan can identify bleeding around the brain, especially when a ruptured aneurysm is suspected.

CT Angiography (CTA)

CTA provides detailed images of the cerebral arteries and helps determine the size, location, and shape of a brain aneurysm.

MRI and MR Angiography (MRA)

MRI and MRA may be used to identify brain aneurysms, assess surrounding structures, and monitor patients during follow-up.

Cerebral Angiography

Digital subtraction angiography, or DSA, provides highly detailed images of cerebral blood vessels and is frequently used when planning endovascular brain aneurysm treatment.

Endovascular Coiling Procedure

Endovascular coiling is usually performed under general anesthesia.

A catheter is inserted into an artery, commonly through the groin or wrist, and guided toward the cerebral blood vessels using advanced X-ray imaging.

A microcatheter is then positioned inside the aneurysm.

Tiny platinum coils are inserted through the microcatheter until the aneurysm is sufficiently filled. The coils promote clot formation and help prevent blood from continuing to enter the aneurysm.

Types of Endovascular Brain Aneurysm Treatment

Standard Endovascular Coiling

Coils are placed directly inside the aneurysm to reduce or stop blood circulation within it.

Stent-Assisted Coiling

A stent may be placed across the aneurysm neck to support the coils and maintain blood flow through the main cerebral artery.

Balloon-Assisted Coiling

A temporary balloon may be inflated during coil placement to help position the coils safely within the aneurysm.

Flow Diversion

A flow-diverting stent may be positioned across the aneurysm to redirect blood flow away from the aneurysm and encourage gradual closure.

The most appropriate treatment depends on the anatomy and characteristics of each cerebral aneurysm.

Recovery After Brain Aneurysm Embolization

Patients are closely monitored after endovascular coiling.

Recovery time varies depending on whether the brain aneurysm was ruptured or unruptured, the complexity of the intervention, and the patient's neurological condition.

Some patients treated for an unruptured brain aneurysm may have a relatively short hospital stay, while patients with ruptured aneurysms may require intensive neurological monitoring and longer hospitalization.

Follow-up CTA, MRA, or cerebral angiography may be recommended to confirm that the treated brain aneurysm remains closed.

Benefits of Endovascular Coiling

Potential benefits of endovascular brain aneurysm treatment may include:

• Minimally invasive approach

• No open skull surgery in suitable cases

• Shorter recovery in selected patients

• Treatment through the blood vessels

• Ability to treat certain complex cerebral aneurysms

• Advanced stent and flow-diversion options when needed

Treatment choice should always be individualized by an experienced neurovascular team.