Brain AVM

A brain arteriovenous malformation (AVM) is a tangle of blood vessels that connect arteries and veins in the brain. The cause of brain AVM is unknown. Researchers believe most brain AVM s are present at birth and form during fetal development, but brain AVM s can develop later in life, as well. Brain AVM s are seen in some people who have hereditary hemorrhagic telangiectasia, also known as Osler-Weber-Rendu syndrome.