An arteriovenous malformation, or AVM, is an abnormal tangle of blood vessels where arteries connect directly to veins without the normal network of tiny capillaries in between. In the brain, this creates a high-pressure, fragile cluster of vessels that can rupture and cause bleeding. Embolization offers a minimally invasive way to treat these malformations from within the blood vessels themselves.

What Is an AVM?

Normally, blood travels from arteries into capillaries, where pressure drops and oxygen is delivered to tissue, before returning through veins. In an AVM, this buffer is missing. High-pressure arterial blood flows directly into veins, stretching and weakening the vessel walls over time.

Most brain AVMs are present from birth, though they often go undetected until symptoms appear — sometimes in adolescence or adulthood.

Symptoms to Watch For

Many AVMs cause no symptoms and are discovered incidentally on imaging done for another reason. When symptoms do occur, they may include:

  • Seizures, sometimes as the first sign
  • Persistent headaches, occasionally severe or localised to one area
  • Weakness, numbness, or difficulty with speech or vision, depending on location
  • A pulsating sound in the ear
  • Sudden severe headache with vomiting or loss of consciousness, indicating a rupture — a medical emergency

Why AVMs Need Attention

The primary concern with a brain AVM is haemorrhage. When these fragile vessels rupture, bleeding into or around the brain can cause stroke, permanent neurological damage, or death. The risk varies depending on the AVM's size, location, and drainage pattern, which is why detailed imaging assessment is essential in deciding whether and how to treat.

What Is AVM Embolization?

AVM Embolization is a minimally invasive procedure performed entirely from inside the blood vessels. A catheter is introduced through a small puncture typically in the groin and navigated under continuous imaging guidance through the arteries into the brain, right up to the vessels feeding the AVM.

A liquid embolic agent or other embolic material is then carefully injected to block the abnormal feeding arteries and the tangle itself, reducing or eliminating blood flow through the malformation.

How Embolization Fits Into Treatment

AVM treatment is highly individualised, and embolization may be used in different ways:

  • As a standalone treatment for smaller, favourably located AVMs
  • Before surgery, to reduce blood flow and make surgical removal safer with less bleeding
  • Before radiosurgery, to shrink the AVM to a size more suitable for targeted radiation
  • To target high-risk features such as associated aneurysms that carry particular rupture risk

Often, treatment is staged across multiple sessions rather than attempted all at once, allowing the brain's circulation to adapt gradually and reducing the risk of complications.

Benefits of the Endovascular Approach

  • No craniotomy — no opening of the skull required
  • Access from a small puncture site, usually in the groin
  • Shorter hospital stay compared with open surgery
  • Can reach deep AVMs located in areas difficult or risky to access surgically
  • Reduces surgical risk when used as a preparatory step

What to Expect

The procedure is performed under general anaesthesia and may take several hours depending on the complexity of the malformation. Patients are monitored closely afterward, typically in a neurological care setting for the first day or two.

Follow-up angiography is important over the following months and years to confirm the AVM remains obliterated and to detect any recurrence or residual flow.

Specialised Neurointerventional Expertise at IRFacilities

AVM embolization is among the most technically demanding procedures in neurointerventional radiology, requiring precise catheter navigation and careful judgement about which vessels to treat and in what order. Dr. Sandeep Sharma brings extensive experience in complex neurovascular interventions, with every case planned through detailed angiographic assessment and, where appropriate, in coordination with neurosurgery and radiosurgery teams.

If you or a family member has been diagnosed with a brain AVM, book a consultation with Dr. Sandeep Sharma at IRFacilities to understand your treatment options.

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