An arteriovenous fistula, or DAVF, is an abnormal connection of vessels in the tissues around the brain or spinal cord in which one or more arteries are directly connected to one or more veins or venous spaces called sinuses. Arteries carry blood from the heart to the tissues, and veins take blood back from the tissues to the heart. In a DAVF, there is a direct connection between one or more arteries and veins or sinuses which gives rise to many problems
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