V: Glossary

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Vascular: Related to blood vessels. Cerebrovascular disorders are those that affect the blood vessels in the brain. More about Cerebrovascular Surgery.

Vasodilatation: An increase in the diameter of blood vessels.

Vasopressin: A hormone secreted by the hypothalamus and stored in the posterior pituitary, which raises blood pressure and increases reabsorption of water by the kidneys.

Vasopressor: An agent which constricts the arteries and raises blood pressure.

Vasospasm: A state of spasm that tightens and narrows blood vessels around a brain aneurysm that are irritated by the blood from cerebral hemorrhage. The body's own attempt to prevent a second hemorrhage by restricting the flow of blood around the aneurysm.

Venous: Related to veins.

Ventricle: The cavities or chambers within the brain that contain the cerebrospinal fluid. There are two lateral ventricles and midline third and fourth ventricles.

Ventricular drainage: Insertion of a small tube into the ventricles to drain cerebrospinal fluid, usually when pressure is increased.

Ventriculitis: Inflammation and/or infection of the ventricles.

Ventriculostomy: An opening into the ventricles of the brain, such as by inserting a small, thin, hollow catheter.

Ventriculo-atrial: Describing a cerebrospinal fluid shunt from one of the ventricles in the brain to the right atrium of the heart.

Ventriculogram: An x-ray study of the ventricles.

Ventriculomegaly: Enlarged cerebral ventricles. See also hydrocephalus.

Ventriculo-peritoneal: Describing a cerebrospinal fluid shunt from one of the ventricles of the brain to the peritoneal cavity in the abdomen.

Vermis: The middle part of the cerebellum between the two hemispheres.

Vertebra: Any of the 33 bones of the spinal column.

Vertebroplasty: An image-guided procedure in which a special bone cement is injected into a fractured vertebra to stabilize the bone and relieve pain. Vertebroplasty is often used to treat spinal compression fractures.

Vertigo: An abnormal sensation of rotation or movement of one's self or the environment.