Cerebral Arteriovenous Malformation (AVM)
If you've been told you have a brain AVM, you're dealing with one of the most misunderstood conditions in neurosurgery. The right answer depends on where it is, how it's built and whether it has already bled — and the team making that call should treat AVMs often enough to know the difference.
What Is Cerebral Arteriovenous Malformation (AVM)?
A cerebral AVM is a tangle of abnormal blood vessels where arteries connect directly to veins without the normal capillary network. Without that buffer, high-pressure arterial blood slams into thin-walled veins, which can weaken and rupture over decades. AVMs affect roughly 10–18 per 100,000 people and are almost always congenital.
Annual hemorrhage risk averages 2–4% per year but varies significantly based on prior hemorrhage, deep venous drainage, eloquent location and presence of associated aneurysms.
At a Glance
- A brain AVM is a tangle of abnormal arteries and veins bypassing the normal capillary network, forcing high-pressure blood into fragile draining veins
- Most AVMs present after hemorrhage, a seizure or as incidental finding on imaging
- The Spetzler-Martin grade (I–V) predicts how safely an AVM can be surgically removed
- Four options: watchful waiting, microsurgical resection, endovascular embolization, stereotactic radiosurgery — often combined
- For unruptured AVMs, the ARUBA trial changed the conversation; treatment decisions require a team that sees these lesions regularly
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