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Vascular Malformation – An abnormality in the development of the blood vessels within the brain resulting in an abnormal collection or pattern of blood vessels in the brain.

Vasospasm – Generally, from four to fourteen days after an aneurysm ruptures, the blood vessels at the base of the brain may develop spasm or narrowing. If severe, this can result in stroke.

Vein – A thick-walled blood vessel carrying blood flow away from an organ and back toward the heart.
Venous Angioma – Also known as developmental venous anomaly or venous malformation. This is one type of vascular malformation of the brain. It represents an unusual pattern of development of the veins in a particular part of the brain. Venous angiomas rarely cause symptoms.

Ventriculostomy – A drainage tube inserted through a small hole in the skull into the fluid-filled spaces in the center of the brain to drain an abnormal build-up of fluid (hydrocephalus) and to relieve pressure.