An arteriovenous malformation (AVM) is a tangle of abnormal arteries and veins. My daughter died on March 13, 2015 from a brain AVM when it ruptured. The Aneurysm and AVM Foundation has detailed information on this rare disease, at https://taafonline.org/conditions/avm. We had never even heard of the disease before that day. Hopefully increased awareness will prevent other families from experiencing a devestaing loss like we have.