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6. Arteriovenous Malformation

An arteriovenous malformation(AVM) is a tangle of blood vessels anywhere within the brain or on its surface. This cluster diverts blood away from normal brain tissue. The vessels dilate over time and may eventually burst from the high pressure of arterial blood flow. If an AVM causes a hemorrhage, the risk of death is 10 to 15%, and the chance of permanent brain damage is 20 to 30%.

What Is a Hemorrhagic Stroke? wenht / Getty Images

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