Aneurysm coiling

Aneurysm coiling in Turkey: what it is and how it works

Aneurysm coiling, medically termed endovascular embolisation, is a minimally invasive neurointerventional procedure designed to isolate a cerebral aneurysm from the normal blood circulation. A brain aneurysm is an abnormal bulge or weakness in the wall of an intracranial artery. If an aneurysm expands, its arterial wall thins, posing a risk of rupture and subarachnoid haemorrhage. During aneurysm coiling, an interventional neuroradiologist or neurosurgeon threads a microcatheter through the vascular system—usually entering via the femoral artery in the groin or the radial artery in the wrist—up into the brain. Soft platinum coils are then deployed directly into the aneurysm cavity. These micro-coils pack the bulge, slow down blood turbulence, and promote localized thrombus formation, effectively sealing off the dome.

Hospitals offering aneurysm coiling in Turkey perform this procedure for both unruptured aneurysms discovered incidentally during brain scans and acute ruptured aneurysms requiring emergency intervention. The endovascular route avoids opening the skull, reducing tissue trauma and initial recovery duration compared with traditional craniotomy. This clinical guide covers how endovascular embolisation functions, what evidence underpins its safety, realistic comparative costs, potential complications, and what to expect during hospitalisation. To explore related cranial and spinal interventions, visit our overview of neurosurgery treatments in Turkey.

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How does endovascular aneurysm coiling work?

The biological principle of endovascular coiling is mechanical packing followed by induced thrombosis. Cerebral aneurysms remain under constant hemodynamic stress from arterial pulsation. When untreated, high-velocity blood inflow maintains tension on the fragile aneurysmal dome. During the procedure, microscopic platinum threads—each engineered with shape memory—are guided into the lumen under high-definition biplane digital subtraction angiography (DSA). Once released from the delivery wire, each coil curls into a stable three-dimensional basket, conforming to the contours of the vascular pouch.

Multiple coils of decreasing diameters are sequentially introduced until the aneurysm achieves dense packing. The physical presence of platinum disrupts intra-aneurysmal blood flow and triggers platelet adhesion and fibrin deposition. Within weeks to months, a durable blood clot forms within the coiled mass, and an endothelial cell layer gradually seals the neck of the aneurysm where it meets the parent vessel. In complex morphologies with wide necks, adjunct devices such as temporary remodeling balloons or intracranial stents are deployed to prevent coils from herniating into the main arterial lumen.

Does aneurysm coiling work and what does clinical evidence show?

Clinical trials and international registry data confirm that endovascular coiling effectively secures cerebral aneurysms against catastrophic rupture. The landmark International Subarachnoid Aneurysm Trial (ISAT) evaluated patients with ruptured intracranial aneurysms amenable to either coiling or open microsurgical clipping. The trial demonstrated that patients treated with endovascular coiling achieved significantly higher rates of survival free of severe disability at one year compared with open surgery, with a 23% relative risk reduction in dependency or death.

For unruptured aneurysms, long-term observational registries confirm that successful endovascular occlusion substantially reduces lifetime rupture rates. However, clinical evidence highlights that coiling requires disciplined radiological surveillance. Approximately 15% to 20% of coiled aneurysms experience some degree of coil compaction or recanalisation over time, where pulsating blood pushes the coil mass deeper into the dome or the neck reopens. Recanalisation is more common in large aneurysms (greater than 10 mm) and wide-necked configurations. While minor recanalisation often remains benign, a proportion of patients require retreatment. A responsible medical team will explain that coiling provides excellent immediate protection while necessitating routine follow-up magnetic resonance angiography (MRA) at defined intervals.

Aneurysm coiling cost in Turkey compared with the UK, US and Germany

The cost of endovascular aneurysm coiling varies according to clinical complexity, the volume and type of implantable devices required, and the duration of neuro-intensive care monitoring. The figures presented below represent approximate ranges for planned, elective endovascular procedures rather than formal hospital quotes. Each clinical centre issues an itemised quotation following a comprehensive review of your vascular imaging.

The primary driver of the aneurysm coiling price is the consumable hardware used in the catheterization laboratory. Each platinum coil, microcatheter, guidewire, intracranial stent, or balloon adds directly to material costs. A small, narrow-necked aneurysm requiring three coils incurs significantly lower expenses than an irregular, wide-necked lesion demanding ten coils alongside a permanent flow-diverting stent. In Turkey, comprehensive treatment packages typically incorporate pre-operative diagnostic angiography, operating theatre and biplane fluoroscopy suite fees, surgical and anaesthetic team charges, one to two nights of intensive care observation, standard ward nursing, post-procedure medications, and initial airport transfers.

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Aneurysm coiling, surgical clipping or flow diversion?

Treatment selection for intracranial aneurysms depends on anatomical factors, patient age, general health, and whether the lesion has ruptured. Modern neurovascular teams assess each case through multidisciplinary review involving interventional neuroradiologists and cerebrovascular surgeons to select the most appropriate modality.

Microsurgical clipping requires an open craniotomy where a microvascular titanium clip is placed across the exterior neck of the aneurysm under an operating microscope. Clipping offers exceptionally high long-term durability with minimal recurrence rates, making it common for middle cerebral artery (MCA) bifurcation aneurysms. However, endovascular coiling avoids brain retraction and incision of skull bone. Flow diverters represent a newer endovascular alternative: rather than filling the aneurysm dome, a dense mesh stent reconstructs the diseased parent artery, redirecting hemodynamic flow away from the sac until it clots naturally. While vascular lesions require endovascular or open microsurgical access, other complex cranial pathologies, such as skull base adenomas, are managed via anterior corridors like transnasal resection of tumor.

Who is an appropriate candidate for endovascular coiling?

Candidacy for aneurysm coiling depends primarily on aneurysm geometry, location, and the patient's physiological resilience. Favourable candidates typically present with saccular aneurysms featuring a distinct, narrow neck (a dome-to-neck ratio greater than 2), lesions situated in the posterior circulation (such as the basilar or vertebral arteries) where open surgery carries higher morbidity, or unruptured aneurysms presenting measurable rupture risk due to size, documented growth, or familial history.

Conversely, endovascular coiling may be less suitable or technically challenging in several clinical scenarios:

• Extremely wide-necked or fusiform aneurysms: When the neck lacks sufficient architecture to support platinum coils without prolapsing into the parent vessel, primary coiling carries higher failure rates unless combined with permanent intracranial stenting.
• Severe arterial tortuosity or vascular stenosis: Severe atherosclerotic disease, calcification, or tortuous carotid anatomy can prevent safe catheter access into intracranial vessels.
• Inability to tolerate antiplatelet medications: If stent-assisted coiling is anticipated, patients must tolerate dual antiplatelet therapy (such as aspirin and clopidogrel or ticagrelor) to prevent acute in-stent thrombosis. Active bleeding disorders or upcoming major surgeries may contraindicate stenting.
• Aneurysms with massive mass effect or parenchymal haematoma: In ruptured cases accompanied by large intracerebral haematomas causing intracranial hypertension, emergency open craniotomy for surgical evacuation and clipping is often required.

What happens during the aneurysm coiling procedure?

Elective aneurysm coiling is performed under general anaesthesia to ensure the patient remains completely still during high-precision microvascular manipulation. The procedure typically requires two to three hours and follows a standardised sequence:

• Vascular access: The neurointerventional team sterilises the groin or wrist and punctures the femoral or radial artery under ultrasound guidance. A vascular sheath is inserted to maintain stable arterial access.
• Diagnostic angiography: A guide catheter is advanced through the aorta into the relevant carotid or vertebral artery. Contrast medium is injected, and three-dimensional rotational angiography constructs detailed maps of the aneurysm dimensions and neck orientation.
• Microcatheter navigation: Using microscopic steerable guidewires under live fluoroscopic road-mapping, a microcatheter is guided directly through the arterial tree into the aneurysm dome.
• Coil deployment and detachment: Platinum micro-coils are advanced through the microcatheter. Once the operator confirms ideal coil configuration, an electric current or mechanical detachment system releases the coil. Consecutive coils are packed until angiography shows stagnant flow within the aneurysm.
• Haemostasis and closure: Catheters are withdrawn, and an automated vascular closure device or manual compression seals the puncture site to prevent haematoma formation.

Aneurysm coiling recovery and hospital stay step by step

The aneurysm coiling recovery process is structured to monitor neurological stability and protect the arterial access site. Following the operation, patients spend the first 12 to 24 hours in a dedicated neuro-intensive care unit (neuro-ICU) or high-dependency unit. Strict flat bed rest is maintained for four to six hours if the femoral artery was punctured, keeping the leg straight to allow the puncture site to seal firmly.

For elective, unruptured aneurysm cases, typical hospital discharge occurs within two to three days. International patients travelling to Turkey should plan an overall stay of seven to ten days. This timeframe allows the multidisciplinary team to perform baseline neurological checks, assess the arterial puncture wound, and verify that blood pressure is well regulated before clearing the patient for air travel. Most individuals resume light desk work within two weeks, whereas strenuous physical exertion and heavy lifting should be deferred for four to six weeks. Modern neurovascular units form a core part of advanced neurosurgery treatments in Turkey, featuring 24-hour intensive care support.

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Aneurysm coiling before and after: follow-up imaging and occlusion

In neurovascular surgery, before-and-after results do not refer to cosmetic appearance but to radiological occlusion confirmed on post-procedure angiography. The goal is complete volumetric obliteration of the aneurysm lumen, classified according to the Raymond-Roy Occlusion Classification:

• Class I (Complete occlusion): Total obliteration of both the aneurysm sac and the neck, with no contrast filling observed.
• Class II (Residual neck): The body of the aneurysm is densely packed with coils, but a small remnant persists at the neck interface.
• Class III (Residual aneurysm): Contrast medium still penetrates into the body of the aneurysm sac between the coils.

High-resolution follow-up imaging is essential to confirm stability. Standard clinical protocols recommend a non-invasive magnetic resonance angiogram (MRA) or computed tomography angiogram (CTA) at 3 to 6 months post-treatment, repeated at 12 to 24 months. If imaging reveals progressive endothelialisation and stable coil packing, the risk of late haemorrhage remains low. If coil compaction or flow channel recanalisation is detected, supplementary coiling or secondary flow diversion may be planned proactively.

Risks and potential complications of aneurysm coiling

While endovascular coiling avoids the physical trauma of open craniotomy, it is an advanced intracranial intervention associated with defined clinical risks. National clinical guidelines, including those published by the National Institute for Health and Care Excellence (NICE), the European Stroke Organisation (ESO), and the American Heart Association (AHA), recognise the following key complications:

• Thromboembolism and ischaemic stroke: Blood clots can form on the surface of microcatheters, coils, or stents during manipulation, potentially dislodging into distal cerebral vessels and causing cerebral ischemia. Intravenous heparin and antiplatelet regimes are administered to minimise this risk.
• Intra-procedural aneurysm perforation: Direct microcatheter or coil contact against an extremely fragile aneurysmal wall can cause acute rupture during embolisation. Although rare, this requires immediate balloon tamponade, rapid coil deployment, and reversal of anticoagulation.
• Coil migration or protrusion: If coils are undersized or unstable, a loop may protrude into the parent artery, disrupting cerebral blood flow or necessitating immediate retrieval or bail-out stenting.
• Puncture site complications: Groin or wrist haematoma, pseudoaneurysm, or retroperitoneal haemorrhage can occur at the arterial access site.
• Adverse contrast reactions: Contrast nephropathy or allergic response to iodine-based agents used during fluoroscopy.

How to choose a neurovascular centre in Turkey and questions to ask

Treating intracranial vascular pathology requires specialized institutional infrastructure. When considering neurointerventional treatment abroad, prospective patients should verify that their chosen hospital meets stringent clinical standards:

• Biplane digital subtraction angiography (DSA) suite: The facility must operate dedicated neurointerventional cath labs equipped with high-resolution biplane imaging and 3D rotational reconstruction capabilities.
• Dedicated neuro-intensive care: Ensure the hospital houses a full-time neuro-ICU staffed by neuro-intensivists and certified neurovascular nursing teams around the clock.
• Experienced multidisciplinary team: Complex aneurysm decisions should involve both endovascular neurosurgeons or interventional neuroradiologists and open cerebrovascular surgeons.
• Defined emergency protocols: The hospital must maintain immediate surgical standby in the event of unanticipated intra-procedural complications.

You can read about how it works when arranging specialist medical travel. Submit your recent MRI or CT angiograms through our free quote portal to receive a preliminary review by senior neurovascular specialists. Contact our care team for a free quote and direct consultation with an interventional specialist.

Questions to ask the clinical team:

• How many endovascular aneurysm coiling procedures does the primary interventionist perform annually?
• Based on my angio scans, what is the neck-to-dome ratio, and will I need stent-assisted coiling or a flow diverter?
• Will I need to start dual antiplatelet medication before the procedure, and for how long afterwards?
• What is your centre's protocol if the aneurysm shows recanalisation or coil compaction during follow-up?
• How many nights will I be observed in the neuro-intensive care unit before transferring to a standard room?
• What specific post-discharge imaging schedule do you recommend after I return home?

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Hospitals with Neurosurgery in Turkey

Academic Hospital

Üsküdar, Istanbul

MoHHealth Tourism Licence+2

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Lokman Hekim Istanbul Hospital

Pendik, Istanbul

JCIMoH+2

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