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PubMed This is a summary of 18 peer-reviewed journal articles Updated
Neurosurgery

Choosing Your Treatment Path

At a Glance

Ruptured brain aneurysms need urgent treatment, usually coiling or clipping, to help prevent another bleed. For unruptured aneurysms, specialists weigh the chance of rupture against procedure risks and may recommend monitoring, coiling, flow diversion, a WEB device, or clipping.

Deciding how to manage a brain aneurysm is a highly individualized process that depends heavily on whether the aneurysm has ruptured.

If an aneurysm has ruptured (Subarachnoid Hemorrhage): This is a neurocritical emergency. The patient requires urgent specialist care in an intensive care unit to stabilize the brain and secure the aneurysm (usually via emergency coiling or clipping) to prevent a second, often fatal, bleed. The elective discussions below do not apply to the acute ruptured pathway.

For unruptured aneurysms: Your medical team will compare the risk of the aneurysm rupturing against the material risks of a procedure [1]. This decision is best made by a multidisciplinary team, which usually includes a neurosurgeon (who performs open surgeries), a neurointerventionalist (who performs minimally invasive procedures through the blood vessels), and a neurologist [1][2].

Conservative Management (Observation)

If the risks of a procedure outweigh the estimated risk of rupture, your doctors may recommend observation. This is often the case for small, stable aneurysms [1][3].

  • What it involves: Regular follow-up imaging to check for any changes in size or shape [1].
  • Lifestyle changes: You must strictly manage your blood pressure and stop combustible smoking. Studies show that aneurysms in smokers grow significantly faster than in non-smokers [1][4].
  • When to reconsider: If a follow-up scan shows confirmed growth, the risk of rupture generally increases, prompting a specialist reassessment of the need for active treatment [5].

Endovascular Treatments (Minimally Invasive)

Endovascular procedures are performed through a catheter inserted into an artery in the leg or wrist and guided to the brain [6]. These carry procedural risks including stroke, vessel injury, bleeding, and device-related clotting.

1. Simple Coiling

The doctor fills the aneurysm with tiny platinum coils, triggering a clot that seals off the aneurysm [7].

  • Pros: Less invasive, shorter hospital stay, and often does not require long-term antiplatelet medication [8][9].
  • Cons: Higher rate of recurrence (the aneurysm reopening) compared to clipping, which may require retreatment [10][11].

2. Stent-Assisted Coiling & Flow Diverters

A flow diverter is a tightly woven mesh stent placed in the main artery across the opening of the aneurysm. It redirects blood flow away from the aneurysm, causing it to gradually occlude (close off), though complete occlusion is not guaranteed [12][13].

  • When it’s used: May be considered for selected anatomies where simple coiling is difficult [12].
  • The Medication Requirement: Because these devices stay in the main artery, you must take dual antiplatelet therapy (DAPT)—medicines that prevent blood platelets from clumping together and clotting on the device [14][15]. Never stop taking these medications without direct instruction from your neuro-team, as stopping them prematurely can cause a life-threatening stroke.

3. Intrasaccular Devices (WEB)

The WEB device is a mesh “basket” placed entirely inside the aneurysm, designed for wide-neck aneurysms at artery branches [16].

  • Benefit: Because the device is tucked inside the aneurysm, some patients may require less intense or shorter-duration antiplatelet therapy, though protocols vary and retreatment is sometimes still necessary [16][17].

Surgical Clipping (Open Surgery)

In this procedure, a surgeon performs a craniotomy (temporarily removing a piece of the skull) to reach the aneurysm and place a small metal clip across its neck [7].

  • Pros: Extremely durable. Once an aneurysm is completely clipped, the chance of recurrence is very low [10][18].
  • Cons: Open surgery carries risks of infection, cranial-nerve injury, seizures, and cognitive/memory effects. It requires a longer hospital stay and recovery [8][9].

Your specific anatomy, age, and personal preferences—weighed alongside the absolute procedural risks provided by your center—will guide which of these paths is the safest for you [3].

Common questions in this guide

How do doctors decide whether to treat or monitor an unruptured brain aneurysm?
A team that may include a neurosurgeon, neurointerventionalist, and neurologist compares the estimated risk of rupture with the risks of a procedure. They consider the aneurysm’s size, shape, location, stability, your age, and your preferences. Monitoring may be recommended when intervention is judged riskier.
What happens if a brain aneurysm has ruptured?
A ruptured brain aneurysm causes bleeding around the brain and is a neurocritical emergency. The patient needs urgent specialist care in an intensive care unit, followed by rapid treatment—usually coiling or clipping—to help prevent another bleed.
Which is better for a brain aneurysm: coiling or clipping?
Neither option is best for everyone. Coiling is less invasive and often has a shorter hospital stay, but the aneurysm is more likely to reopen and need another treatment. Clipping requires open surgery and a longer recovery but is very durable when the aneurysm is completely clipped.
Will I need antiplatelet medicine after a flow diverter or stent?
A flow diverter or stent-assisted procedure usually requires dual antiplatelet medicines to reduce the chance of a clot forming on the device. Your neuro team will tell you how long to take them, and you should never stop them without direct instructions because early stopping can cause a serious stroke.
What is the WEB device used for in brain aneurysm treatment?
The WEB device is a mesh basket placed inside an aneurysm, often for selected wide-neck aneurysms at artery branches. Because it does not sit across the main artery, some patients may need less intense or shorter antiplatelet treatment, but protocols vary and another procedure may still be needed.
What does observation involve for an unruptured brain aneurysm?
Observation means regular follow-up scans to look for changes in the aneurysm’s size or shape, along with careful blood pressure management and stopping smoking. Confirmed growth usually increases concern about rupture and leads the specialist team to reconsider active treatment.
What are the main risks of brain aneurysm procedures?
Endovascular procedures can cause stroke, blood-vessel injury, bleeding, or clotting related to the device. Open clipping also carries risks such as infection, cranial-nerve injury, seizures, and changes in memory or thinking, and coiling can have recurrence. Ask your team about its complication, successful occlusion, and retreatment rates for the recommended procedure.

Questions to Ask Your Doctor

Curated prompts to bring to your next appointment.

  1. 1.Does our multidisciplinary care team include both a neurosurgeon and a neurointerventionalist, and have they discussed my case together?
  2. 2.Based on my aneurysm's shape and location, what is the estimated risk of the procedure versus the risk of it rupturing if we just monitor it?
  3. 3.If we choose stent-assisted coiling or a flow diverter, how long will I need to be on antiplatelet medicines?
  4. 4.What are the specific risks of stroke, bleeding, or needing a repeat procedure for the treatment you are recommending?
  5. 5.What are your personal or center-specific rates for complications and successful occlusion for this exact procedure?

Questions For You

Tap a prompt to share your answer — we'll use it plus this page's context to start a tailored conversation.

References

References (18)
  1. 1

    European Stroke Organisation (ESO) guidelines on management of unruptured intracranial aneurysms.

    Etminan N, de Sousa DA, Tiseo C, et al.

    European stroke journal 2022; (7(3)):V doi:10.1177/23969873221099736.

    PMID: 36082246
  2. 2

    Survey of European neurosurgeons' management of unruptured intracranial aneurysms: inconsistent practice and organization.

    Skodvin TØ, Kloster R, Sorteberg W, Isaksen JG

    Acta neurochirurgica 2021; (163(1)):113-121 doi:10.1007/s00701-020-04539-8.

    PMID: 32870423
  3. 3

    Development of the SAFETEA Scores for Predicting Risks of Complications of Preventive Endovascular or Microneurosurgical Intracranial Aneurysm Occlusion.

    Algra AM, Greving JP, de Winkel J, et al.

    Neurology 2022; (99(16)):e1725-e1737 doi:10.1212/WNL.0000000000200978.

    PMID: 36240099
  4. 4

    PHASES and ELAPSS Scores Are Associated with Aneurysm Growth: A Study of 431 Unruptured Intracranial Aneurysms.

    Brinjikji W, Pereira VM, Khumtong R, et al.

    World neurosurgery 2018; (114()):e425-e432 doi:10.1016/j.wneu.2018.03.003.

    PMID: 29530704
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    Risk Factors for Growth of Intracranial Aneurysms: A Systematic Review and Meta-Analysis.

    Brinjikji W, Zhu YQ, Lanzino G, et al.

    AJNR. American journal of neuroradiology 2016; (37(4)):615-20 doi:10.3174/ajnr.A4575.

    PMID: 26611992
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    Current Perspectives in Imaging Modalities for the Assessment of Unruptured Intracranial Aneurysms: A Comparative Analysis and Review.

    Turan N, Heider RA, Roy AK, et al.

    World neurosurgery 2018; (113()):280-292 doi:10.1016/j.wneu.2018.01.054.

    PMID: 29360591
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    Role of hemodynamics in initiation/growth of intracranial aneurysms.

    Diagbouga MR, Morel S, Bijlenga P, Kwak BR

    European journal of clinical investigation 2018; (48(9)):e12992 doi:10.1111/eci.12992.

    PMID: 29962043
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    A Pragmatic Randomized Trial Comparing Surgical Clipping and Endovascular Treatment of Unruptured Intracranial Aneurysms.

    Darsaut TE, Findlay JM, Bojanowski MW, et al.

    AJNR. American journal of neuroradiology 2023; (44(6)):634-640 doi:10.3174/ajnr.A7865.

    PMID: 37169541
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    Treatments for unruptured intracranial aneurysms.

    Pontes FGB, da Silva EM, Baptista-Silva JC, Vasconcelos V

    The Cochrane database of systematic reviews 2021; (5()):CD013312 doi:10.1002/14651858.CD013312.pub2.

    PMID: 33971026
  10. 10

    Evolution of the patient-first approach: a dual-trained, single-neurosurgeon experience with 2002 consecutive intracranial aneurysm treatments.

    Waqas M, Monteiro A, Cappuzzo JM, et al.

    Journal of neurosurgery 2022; (137(6)):1751-1757 doi:10.3171/2022.2.JNS22105.

    PMID: 35364567
  11. 11

    Long-term outcomes of endovascular simple coiling versus neurosurgical clipping of unruptured intracranial aneurysms: A systematic review and meta-analysis.

    Krag CH, Speiser L, Dalby RB

    Journal of the neurological sciences 2021; (422()):117338 doi:10.1016/j.jns.2021.117338.

    PMID: 33596532
  12. 12

    The Evolution of Flow-Diverting Stents for Cerebral Aneurysms; Historical Review, Modern Application, Complications, and Future Direction.

    Shin DS, Carroll CP, Elghareeb M, et al.

    Journal of Korean Neurosurgical Society 2020; (63(2)):137-152 doi:10.3340/jkns.2020.0034.

    PMID: 32120455
  13. 13

    Prospective study on embolization of intracranial aneurysms with the pipeline device (PREMIER study): 3-year results with the application of a flow diverter specific occlusion classification.

    Hanel RA, Cortez GM, Lopes DK, et al.

    Journal of neurointerventional surgery 2023; (15(3)):248-254 doi:10.1136/neurintsurg-2021-018501.

    PMID: 35292570
  14. 14

    Managing thrombosis risk in flow diversion: A review of antiplatelet approaches.

    Toma A, Essibayi MA, Osama M, et al.

    The neuroradiology journal 2025; (38(5)):588-598 doi:10.1177/19714009251313515.

    PMID: 39772903
  15. 15

    Optimal duration of dual antiplatelet therapy for stent-assisted coiling or flow diverter placement.

    Enomoto Y, Matsubara H, Ishihara T, et al.

    Journal of neurointerventional surgery 2024; (16(5)):491-497 doi:10.1136/jnis-2023-020285.

    PMID: 37344176
  16. 16

    Review of Endosaccular Flow Disrupters for Wide-Neck Aneurysm Treatment.

    DeMessie B, Vaishnav D, Karandish A, et al.

    Cardiology in review 2025; doi:10.1097/CRD.0000000000000869.

    PMID: 39883855
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    A review and journey in intrasaccular treatment of intracranial aneurysms.

    Islim FI, Saleem N, Patankar T

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    Risk of intracranial aneurysm recurrence after microsurgical clipping based on 3D digital subtraction angiography.

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    PMID: 35907194

This page is for informational purposes only and does not constitute medical advice. Discuss your aneurysm’s rupture risk, treatment options, and any antiplatelet medicines with your neurosurgeon, neurointerventionalist, or neurologist.

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