brain avm. tangled blood vessels that connects arteries and veins

malformation hemorrhage resonance venous tomography cluster ischemic aneurysm vascular defect disease capillary arteries neuroradiologists cavernous cavernoma neurovascular subarachnoid damage arteriovenous intracerebral neurosurgery tangled swollen intracranial medical vision rupture diagnosis problem symptom consciousness paralysis dizziness bleeding examination dementia disorder seizures avm blood vein human vessel types body set