Arteriovenous malformations (AVMS) are tangles of dilated, thin-walled blood vessels that occur anywhere within the brain or on the dura mater (the covering of the brain).
A brain aneurysm, also called a cerebral or intracranial aneurysm, is an abnormal bulging outward of one of the arteries in the brain. This may be due to a weakness or injury to one or more of the three layers of tissue in the vessel wall.
Hereditary hemorrhagic telangiectasia (HHT) is typically a hereditary or sometimes, de novo condition that affects the blood vessels. The condition is also known as Osler-Weber-Rendu syndrome.
There are two major types of stroke: hemorrhagic and ischemic. A hemorrhagic stroke refers to bleeding occurring in the brain or in the space surrounding the brain (subarachnoid hemorrhage). An ischemic stroke occurs when there is occlusion of a blood vessel, resulting in lack of blood supply to an area of the brain and death of brain tissue (infarction).
