Surgical Clipping for Brain Aneurysm

Medically reviewed by Ronald P. Benitez, MD ·4 min read

Fellowship-trained cerebrovascular neurosurgeons • 12 hospital affiliations across New Jersey

In short

Surgical clipping is an open neurosurgical procedure in which a titanium clip is placed across the neck of an intracranial aneurysm through a craniotomy, permanently cutting off the aneurysm from the blood supply and eliminating the risk of rupture. It is the most durable treatment for brain aneurysms and is preferred for certain aneurysm types and anatomies where endovascular coiling is less reliable.

Key takeaways

Surgical clipping permanently excludes the aneurysm from circulation, providing durable, long-term treatment.
A titanium clip placed across the aneurysm neck allows the aneurysm to thrombose and shrink while normal blood flow in the parent artery is preserved.
Clipping is preferred for wide-necked aneurysms, MCA bifurcation aneurysms, and large hematomas requiring simultaneous evacuation.
Intraoperative angiography confirms complete clip occlusion before the craniotomy is closed.
Dr. Ronald P. Benitez and the ABS cerebrovascular team perform both clipping and coiling, selecting the optimal treatment for each aneurysm.

SURGICAL CLIPPING AT A GLANCE

Procedure type	Open craniotomy with microsurgical clip application to aneurysm neck
Anesthesia	General anesthesia with IONM and intraoperative angiography
Surgery time	3 to 6 hours depending on aneurysm location and complexity
Hospital stay	3 to 5 nights for elective clipping; longer for ruptured aneurysm
Best suited for	Wide-neck aneurysms, MCA aneurysms, select ruptured aneurysms, and aneurysms requiring decompression
Durability	Long-term occlusion rates of approximately 95 to 99% more durable than coiling
Intraoperative confirmation	Angiography or ICG video angiography confirms clip position and parent vessel patency
Conditions treated	Unruptured and ruptured intracranial aneurysms

Timing and stay vary by patient and complexity. Your surgeon will confirm what to expect in your case.

How surgical clipping works

A craniotomy is performed over the affected cerebral hemisphere. The brain is gently retracted using microsurgical technique to expose the vessels at the base of the brain where the aneurysm arises. Under high-powered microscope magnification, the surgeon dissects around the aneurysm, identifying the parent artery, the aneurysm neck, and all nearby branches.

A titanium clip a small, spring-loaded device designed for permanent implantation is precisely placed across the neck of the aneurysm, closing it off from circulation. The clip position is confirmed by direct visualization, indocyanine green (ICG) video angiography, and often intraoperative catheter angiography. The aneurysm sac, now excluded from circulation, thromboses and eventually shrinks.

When clipping is preferred over coiling

The choice between surgical clipping and endovascular coiling depends on multiple factors evaluated individually:

Wide-necked aneurysms: A wide neck allows coils to prolapse into the parent artery. Surgical clipping remains more reliable for many wide-necked configurations.
MCA bifurcation aneurysms: Middle cerebral artery aneurysms are surgically accessible through a standard temporal craniotomy with high cure rates and good outcomes.
Large hematoma requiring evacuation: The same craniotomy used to clip the aneurysm can evacuate a large hematoma causing mass effect.
Young patients with long life expectancy: The superior long-term durability of clipping may be the deciding factor in younger patients, avoiding surveillance imaging and potential re-treatment over decades.
Prior coil failure: Aneurysms that have recanalized after coiling may be better served by surgical clipping as a revision treatment.

Benefits and risks

Potential benefits

Most durable aneurysm treatment approximately 95 to 99% long-term occlusion, lower re-treatment rate than coiling
Immediate, permanent cure for appropriately selected aneurysms
Allows simultaneous hematoma evacuation when a ruptured aneurysm presents with mass effect
Intraoperative confirmation of complete occlusion before closure

Possible risks

Craniotomy risks: infection, bleeding, brain swelling, stroke from retraction or vessel injury
Clip slippage or incomplete occlusion -- confirmed intraoperatively and adjusted before closure
Neurological deficit from manipulation near eloquent brain or perforator vessels
Longer recovery compared to endovascular coiling

Your surgeon will review the benefits and risks specific to your diagnosis during your consultation.

What recovery looks like

Recovery from surgical clipping for brain aneurysm is longer than endovascular coiling:

Days 1 to 3 ICU monitoring for the first 24 to 48 hours, then step-down. Hospital stay of 3 to 5 nights for elective clipping.
Weeks 1 to 3 Home with activity restrictions. Fatigue and headache are common. Light walking encouraged; no driving or heavy lifting.
Weeks 4 to 6 Gradual return to normal activity. Post-operative imaging to confirm clip position and aneurysm occlusion.
3 to 6 months Full activity clearance. Long-term follow-up MRA or angiography at 1 year and periodically thereafter.

Frequently asked questions

Is surgical clipping permanent?

Yes. A properly placed surgical clip permanently occludes the aneurysm. Long-term follow-up studies show stable clip position and aneurysm occlusion rates of approximately 95 to 99% at 10 years — significantly more durable than coil embolization.

Will the clip set off a metal detector?

Titanium aneurysm clips are not magnetic and do not set off airport metal detectors. They are also MRI-compatible — you can have brain and spine MRI after surgical clipping without concern about clip movement.

What is the difference between surgical clipping and coiling for ruptured aneurysms?

Both treatments are used for ruptured aneurysms causing subarachnoid hemorrhage. The ISAT trial showed better short-term outcomes with coiling in most patients. However, clipping is preferred when large hematomas require evacuation, or when the aneurysm anatomy is better suited to clipping.

Can new aneurysms form after clipping?

The clipped aneurysm itself is permanently treated. However, patients with brain aneurysms have a higher risk of forming new aneurysms elsewhere in the cerebrovascular system — approximately 1 to 2% per year. Annual or periodic MRA surveillance is recommended for most patients who have had an intracranial aneurysm treated.

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 Vascular Neurosurgical Care at 973.993.7772 or request a consultation.