Arteriovenous malformation (AVM) is a congenital disorder of blood vessels in the brain, brainstem, or spinal cord that is characterized by a complex, tangled web of abnormal arteries and veins connected by one or more fistulas (abnormal communications). Symptoms of arteriovenous malformations include seizures and headaches. Treatment of arteriovenous malformations include medication or surgery. Read more: Arteriovenous Malformation Article
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