What Is Interventional Neuroradiology?
This website is a resource for patients, families, and referring physicians who want to understand these conditions and the treatment approaches available.
What Does an Interventional Neuroradiologist Do?
Three pillars of the specialty
Diagnosis through clinical correlation with advanced imaging
Minimally invasive treatment
Management of time-critical emergencies
Conditions managed
Conditions managed by an Interventional Neuroradiologist
The specialty covers a wide range of conditions affecting the brain, spinal cord, and head and neck:
- Acute ischaemic stroke — emergency clot removal
- Brain aneurysms — preventing and treating rupture
- Brain and spinal arteriovenous malformations (AVMs)
- Dural arteriovenous fistulas (dAVFs)
- Carotid and vertebral artery disease
- Venous sinus stenosis and idiopathic intracranial hypertension (IIH)
- Spinal vascular malformations
- Head and neck vascular disorders
- Pre-surgical tumour embolization
- Pediatric neurointerventions including intra-arterial chemotherapy
- Carotid-cavernous fistulas (CCFs)
- Middle meningeal artery (MMA) embolization for chronic brain bleeds and unremitting headaches
- CSF leak treatment, including CSF-venous fistula embolization
How Interventional Neuroradiology Treatment Works
All interventional neuroradiology procedures share the same fundamental approach — they work through the body’s existing blood vessel network, guided by continuous imaging, without the need for large incisions or opening the skull or spine.
Step-by-step explanation
Step 1 — Access
A small puncture is made in the skin — usually at the wrist (radial access) or groin (femoral access). A thin, flexible tube called a sheath is placed into the artery.
Step 2 — Navigation
Using real-time X-ray imaging called fluoroscopy, together with contrast dye injected into the bloodstream, the doctor guides a catheter through the arteries all the way to the brain or spine. The vessels are visualised in detail using digital subtraction angiography (DSA) — the gold standard for neurovascular imaging.
Step 3 — Treatment
Once the catheter is precisely positioned, the appropriate device or agent is deployed. This could be a coil filling an aneurysm, a stent opening a narrowed artery, a flow diverter redirecting blood away from a weak vessel wall, or a liquid embolic agent closing an abnormal vascular connection.
Step 4 — Confirmation and recovery
After the procedure, imaging confirms the result. The catheter is removed, the puncture site is sealed, and the patient is monitored in a recovery unit. Most patients are discharged within one to two days for elective procedures.
Why this approach matters
Why this approach is significant
For many neurovascular conditions, endovascular treatment offers outcomes that are equivalent or superior to open surgery, with considerably lower procedural risk, no craniotomy scar, shorter hospital admission, and faster return to normal activity. For acute stroke, it has transformed outcomes — large clinical trials have demonstrated that mechanical thrombectomy can restore meaningful function in patients who would previously have been left with severe disability.
Why this is the most advanced way to treat the brain
What makes Interventional Neuroradiology so advanced is the union of imaging, micro-engineering, and precision — allowing some of the most feared diseases of the brain and spine to be treated without ever cutting it open.
- No skull is opened. The whole treatment is delivered through a minute 2 mm opening in a vessel of the leg or hand — no skull is opened. The body’s own arteries become the road to the brain.
- Instruments as fine as a strand of hair. The instruments used to navigate the brain’s most delicate vessels can be as thin as a single human hair — fine enough to reach territory once considered untouchable.
- Treated in minutes. Even the most ominous brain diseases are often treated in a matter of minutes — what once meant hours of open surgery is now resolved swiftly.
- Recovery is immediate. There is no long recovery and no large wound to heal — most patients are discharged the very next day.
A 2 mm entry point, instruments finer than a hair, the brain’s most dangerous conditions resolved in minutes, and home the next day — this is what places Interventional Neuroradiology at the frontier of modern medicine.
Conditions Treated Through Interventional Neuroradiology
Each condition below has a dedicated page explaining what it is, how it develops, what symptoms it causes, how it is diagnosed, and what treatment options are available. The information is written for patients and families, not for medical professionals.
Three pillars of the specialty
Brain Aneurysm
A bulge in the wall of a brain artery. Many are discovered incidentally. Some can rupture, causing a life-threatening bleed. Understanding the risk factors and available treatments can help patients and families make informed decisions.
Stroke
A sudden interruption of blood supply to part of the brain. Ischaemic stroke — caused by a clot — accounts for most cases. Knowing the warning signs and acting within the treatment window can make a significant difference to outcomes.
Brain AVM (Arteriovenous Malformation)
An abnormal tangle of blood vessels in the brain, present from birth, in which arteries and veins are directly connected without the usual network of capillaries. AVMs can bleed, cause seizures, or produce headaches.
Carotid & Vertebral Artery Disease
Narrowing or blockage of the main arteries supplying the brain, usually due to atherosclerosis. This is one of the leading preventable causes of stroke. It often produces no symptoms until a TIA or stroke occurs.
Venous Sinus Stenosis & IIH
Narrowing of the brain’s venous drainage channels can raise pressure inside the skull, causing persistent headaches, pulsatile tinnitus, and visual disturbances. This condition is often underdiagnosed, particularly in young women.
Spinal Vascular Malformations
Abnormal blood vessel connections within or around the spinal cord. These conditions are rare and frequently misdiagnosed for years. Progressive leg weakness and bladder changes are common presentations.
Head & Neck Vascular Disorders
A group of vascular conditions affecting the face, skull base, and neck — including carotid-cavernous fistulas, scalp AVMs, and vascular causes of recurrent nosebleeds. Symptoms vary widely depending on which vessels are involved.
Tumor Embolization
Certain brain and skull-base tumours have a rich blood supply that makes surgery risky. Embolization before surgery reduces this blood supply, making the operation safer and more effective. It is a preparatory procedure, not a standalone treatment for the tumour itself.
Dural Arteriovenous Fistulas (dAVFs)
An abnormal connection between an artery and a vein in the coverings of the brain or spine. dAVFs can cause a whooshing sound in the ear, headaches, and, if untreated, bleeding. They are often treatable entirely through endovascular embolization.
Carotid-Cavernous Fistulas (CCFs)
An abnormal connection between the carotid artery and the venous network behind the eye. A CCF can cause a red, bulging, or pulsating eye and visual disturbance. It can be closed from the inside using endovascular techniques.
MMA Embolization
Embolization of the middle meningeal artery is a newer endovascular technique used to treat certain chronic brain bleeds (chronic subdural haematoma) and some cases of unremitting headache. It addresses the source of the problem through a tiny catheter, often avoiding open surgery.
CSF Leak & CSF-Venous Fistula
A leak of cerebrospinal fluid can cause severe positional headaches that are often missed for years. When the cause is a CSF-venous fistula, it can be treated with a precise, minimally invasive embolization — sealing the leak and relieving the headache.
Neurological Symptoms That Deserve Attention
Many neurovascular conditions develop silently over months or years and are discovered only after a serious event. Others produce early warning signs that are easy to attribute to stress, fatigue, or ageing. The list below is intended to help people recognise symptoms that warrant medical evaluation — not to cause alarm or enable self-diagnosis.
Sudden weakness or difficulty speaking
One-sided weakness, facial drooping, slurred speech, or sudden inability to understand words are classic signs of stroke. These are time-critical emergencies. Call emergency services immediately — do not wait to see if symptoms improve.
The worst headache of your life
A sudden, severe headache — often described as a thunderclap — that reaches maximum intensity within seconds can indicate a ruptured brain aneurysm. This requires emergency medical attention. It is different from a tension headache or migraine.
A rhythmic whooshing sound in the ear
Pulsatile tinnitus — a heartbeat-like sound in one ear that synchronises with the pulse — can be associated with abnormal vascular connections near the brain, such as a dural AVF, or raised intracranial pressure.
Sudden dizziness, imbalance, or double vision
These symptoms, especially when they occur together or with weakness in a limb, can indicate involvement of the arteries supplying the back of the brain (posterior circulation). They should not be dismissed as inner ear problems without proper assessment.
Eye redness, bulging, or pulsation
One eye that appears red, protrudes slightly, or has a visible pulsation may indicate a carotid-cavernous fistula — an abnormal connection between an artery and the venous network behind the eye. This is treatable with endovascular techniques.
Progressive leg weakness or bladder changes
Gradual weakness in both legs, sensory disturbance below a certain level, or new bladder or bowel dysfunction that worsens over time may have a spinal vascular cause. Spinal dural AVFs are frequently mistaken for degenerative spine disease.
Daily headaches with brief visual blackouts
Persistent headache combined with brief episodes in which vision dims or greys out — triggered by bending, coughing, or standing — can be a sign of raised intracranial pressure, sometimes caused by venous sinus stenosis.
Recurrent unexplained nosebleeds
Nosebleeds that recur despite standard treatment, or that are particularly heavy and difficult to stop, can occasionally have a vascular cause in the vessels of the nasal cavity or skull base, which can be assessed and treated endovascularly.
Important: This list is for general awareness only. It is not a diagnostic tool and should not replace medical consultation. If you or someone near you is experiencing sudden weakness, severe headache, or loss of consciousness, call emergency services immediately.
“Many of the conditions we treat are either silent until a crisis occurs, or they produce symptoms that are easy to misattribute. The purpose of this website is simply to make that information accessible — so that patients and families arrive at a specialist consultation already informed, and referring doctors have a resource they can point their patients towards.”
— Dr. Savyasachi Jain, Interventional Neuroradiologist, AIIMS New Delhi
About the Specialist Behind This Resource
An interventional neuroradiologist is trained to clinically examine your symptoms and correlate with basic and advanced imaging, to arrive at a precise diagnosis. This helps in planning the treatment, reducing error rate to absolutely nil.
Dr. Savyasachi Jain is an Interventional Neuroradiologist and Assistant Professor in Neuroimaging and Interventional Neuroradiology at AIIMS, New Delhi. He has received advanced training in neurovascular imaging and endovascular procedures, with a focus on the diagnosis and management of complex neurological conditions.
His clinical and academic work involves the use of minimally invasive, image-guided techniques for conditions such as acute stroke, brain aneurysms, arteriovenous malformations (AVMs), and spinal vascular disorders. With experience in handling high-risk and time-sensitive cases, his approach emphasizes precision, safety, and evidence-based decision making.
Dr. Jain is actively involved in teaching, research, and multidisciplinary collaboration, contributing to advancements in neurointervention and patient care.
FAQs (Educational & Awareness-Focused)
What is neurointervention?
Minimally invasive, image-guided techniques to diagnose and manage brain and spinal vascular conditions.
How can I recognize a stroke?
Look for FAST signs—Face drooping, Arm weakness, Speech difficulty, and seek urgent medical attention.
What are AVMs and aneurysms?
AVMs are abnormal artery-vein connections; aneurysms are weakened blood vessel areas. Awareness and imaging help monitor them.
Are these procedures applicable to children?
Certain pediatric vascular conditions can be safely evaluated with specialized imaging techniques.
Can I receive direct medical advice on this website?
No. This website is strictly for educational and awareness purposes and does not provide medical advice or solicitation.