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Dural Arteriovenous Fistulas

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  • Dural arteriovenous fistulas

    Dural arteriovenous fistulae (DAVF) are rare, abnormal connections between arteries and veins in a protective membrane on the outer layer of the brain and spine, called the dura. These abnormal blood vessels divert blood from the normal paths. If the volume of diverted blood flow is large, tissue downstream may not receive an adequate blood and oxygen supply. An unusually heavy blood flow also can lead to aneurysms or ruptures in the veins. This condition can be caused by head trauma, infection, surgery or blood clots in the brain, called thrombosis, or may be a congenital or birth defect. Dural arteriovenous fistula (DAVF) are a heterogeneous collection of conditions that share arteriovenous shunts from dural vessels. They make up 10-15% of all cerebral vascular malformations. They typically have multiple feeders and are usually acquired. Idiopathic origin, trauma, and previous craniotomy are possible etiopathogenic explanations, however they most frequently occur as a result of neovascularisation induced by previously thrombosed dural venous sinus (typically transverse sinus).

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