Coil Embolization for Brain Aneurysm
Fellowship-trained cerebrovascular and endovascular neurosurgeons • 12 hospital affiliations across New JerseyCoil embolization is a minimally invasive endovascular procedure in which a microcatheter is guided through the blood vessels from the wrist or groin to a brain aneurysm, and soft platinum coils are placed inside the aneurysm to prevent blood from entering it. By sealing the aneurysm from within, coil embolization significantly reduces the risk of rupture or rebleeding. It is one of several effective treatment options for brain aneurysms, and the most appropriate approach depends on the aneurysm’s anatomy, location, and the patient’s overall health.
Key takeaways
- Coil embolization treats a brain aneurysm from inside the blood vessel using platinum coils delivered through a catheter without the need for a craniotomy.
- It is an effective treatment option for many brain aneurysms, particularly those with anatomy well suited to endovascular therapy.
- Advanced techniques including balloon-assisted and stent-assisted coiling allow many complex aneurysms to be treated endovascularly.
- Atlantic Brain and Spine's multidisciplinary cerebrovascular team offers the full spectrum of endovascular and microsurgical aneurysm treatment, selecting the safest and most effective approach for each patient.
- Most patients undergoing elective coil embolization are discharged within 1 to 2 days after treatment.
| Procedure type | Endovascular treatment of a brain aneurysm using detachable platinum coils |
| Access site | Femoral artery (groin) or radial artery (wrist) |
| Anesthesia | General anesthesia |
| Procedure time | Typically 1 to 3 hours, depending on aneurysm anatomy |
| Hospital stay | Typically 1 to 2 nights for elective treatment; longer for ruptured aneurysms (subarachnoid hemorrhage) |
| Conditions treated | Unruptured and ruptured intracranial aneurysms |
| Follow-up imaging | MRA or catheter angiography at approximately 6 months, 18 months, and periodically thereafter, depending on aneurysm characteristics |
Timing and stay vary by patient and complexity. Your surgeon will confirm what to expect in your case.
How coil embolization works
Under general anesthesia, a sheath is placed in the femoral or radial artery. A catheter is advanced through the body’s blood vessels into the carotid or vertebral arteries, then navigated to the aneurysm using real-time X-ray (fluoroscopy) guidance.
A microcatheter smaller than a millimeter in diameter is carefully guided into the aneurysm sac. Soft platinum coils are deployed one at a time, where they coil upon themselves to fill the aneurysm. As additional coils are placed, they create a dense framework that promotes clot formation and seals the aneurysm off from the circulation.
Balloon-assisted and stent-assisted coiling
Wide-necked aneurysms often require additional techniques to prevent coils from protruding into the parent artery:
- Balloon-assisted coiling: A small balloon is temporarily inflated across the aneurysm neck during coil placement, then deflated and removed before the procedure is completed.
- Stent-assisted coiling: A self-expanding stent is placed across the aneurysm neck within the parent artery, creating a scaffold that helps keep the coils securely inside the aneurysm. Because the stent remains permanently in place, patients typically require dual antiplatelet therapy for several months afterward.
Coil embolization versus surgical clipping
The two primary treatments for intracranial aneurysms are endovascular coil embolization and microsurgical clipping. Both are highly effective, and neither is universally better than the other. The most appropriate treatment depends on the aneurysm’s size, shape, location, risk of rupture, and the patient’s overall health. Large clinical trials, including the landmark International Subarachnoid Aneurysm Trial (ISAT), demonstrated that endovascular coiling can provide better short-term outcomes than surgical clipping for appropriately selected aneurysms.
Factors that may favor coil embolization include many posterior circulation aneurysms, older or medically frail patients, and aneurysms with anatomy well suited to endovascular treatment.
Factors that may favor microsurgical clipping include some wide-necked aneurysms, many middle cerebral artery (MCA) bifurcation aneurysms, aneurysms associated with large intracranial hematomas requiring evacuation, and selected younger patients when long-term durability is an important consideration.
Atlantic Brain and Spine’s multidisciplinary cerebrovascular team reviews every case individually to recommend the treatment approach that offers the safest and most effective outcome.
Benefits and risks
Potential benefits
- Minimally invasive treatment performed through the blood vessels no craniotomy required.
- Shorter hospital stay and faster recovery than surgical clipping for many appropriately selected patients.
- Effective for many posterior circulation aneurysms, which can be more challenging to treat with open surgery.
- Can be performed immediately after diagnostic angiography in emergency situations, allowing rapid treatment of ruptured aneurysms.
Possible risks
- Small risk that the aneurysm may reopen over time, requiring periodic follow-up imaging and, in some cases, additional treatment.
- Coil compaction or shifting can occasionally reopen the aneurysm neck, increasing the need for long-term surveillance.
- Rare risk of blood clot formation during or after the procedure, which can lead to stroke despite preventive medications.
- Rare but serious risk of aneurysm rupture during catheter or coil placement.
Your surgeon will review the benefits and risks specific to your diagnosis during your consultation.
What recovery looks like
Recovery from elective coil embolization is significantly faster than from open craniotomy:
- Day of procedure Recovery in a monitored setting for 4 to 6 hours. The groin or wrist access site is monitored, and most patients stay overnight for observation after elective treatment.
- Days 1 to 2 Discharge home after a stable neurological examination. Avoid strenuous activity and follow groin or wrist access precautions for 48 hours.
- Weeks 1 to 2 Gradual return to light activity. Avoid heavy lifting and strenuous exercise for 1 to 2 weeks. Many patients return to desk work within several days.
- Long-term follow-up Follow-up MRA or catheter angiography is typically performed at approximately 6 months, with additional imaging scheduled periodically thereafter based on the aneurysm, treatment technique, and individual risk of recurrence.
Frequently asked questions
Is the aneurysm permanently cured after coiling?
Coil embolization provides durable aneurysm occlusion for most patients, but long-term follow-up imaging is essential. Compared with surgical clipping, coil embolization has a higher likelihood that a small portion of the aneurysm may reopen over time because the coils can compact or the aneurysm neck can gradually recanalize. Most recurrences are small and do not require additional treatment, but periodic MRA or catheter angiography is recommended to ensure the aneurysm remains securely occluded.
Can I have an MRI after coil embolization?
Yes. Platinum coils used in modern embolization are MRI-compatible. Standard brain and spine MRI can be performed after coiling.
What happens during subarachnoid hemorrhage treatment?
When a brain aneurysm ruptures and causes subarachnoid hemorrhage (SAH), the aneurysm must be secured as quickly as possible to prevent re-bleeding. Coil embolization can be performed urgently within hours of the hemorrhage in the same angiography suite. Patients require prolonged ICU monitoring after SAH to manage vasospasm, hydrocephalus, and other complications.
Will I need blood thinners after coil embolization?
Most patients who undergo primary coil embolization do not need blood thinners after the procedure. This is one reason coil embolization is often a good option for patients with a ruptured brain aneurysm.
If your aneurysm requires a stent-assisted procedure, you will need to take two antiplatelet medications (most commonly aspirin and clopidogrel) for approximately six months while the stent heals into the blood vessel. Your neurosurgeon will explain which medications you need and how long you should take them based on your specific treatment.
This page is for general education and does not replace medical advice. Treatment decisions should be made with a qualified neurosurgeon based on your individual diagnosis and imaging. To discuss your options, call Atlantic Brain and Spine at 973.993.7100 or request a consultation.
Neurovascular Specialists at Atlantic Brain and Spine
Your care is provided by Atlantic Brain and Spine's multidisciplinary cerebrovascular team, including fellowship-trained cerebrovascular and endovascular neurosurgeons.
