An AVM is a specific type of vascular malformation that may be found in the brain. AVM stands for arteriovenous malformation or artery-vein malformation. It is a disordered tangle of arteries and veins. AVMs can occur anywhere in the brain, and no two are identical in shape, size or location.
AVMs are congenital, meaning that people are born with them. They appear to be related to improper development of the capillaries that connect the arteries and veins.
AVMs can potentially be very dangerous. When an AVM bleeds, the blood flows into the surrounding brain, causing a blood clot in the brain. Bleeding from an AVM can cause death or permanent disability.
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