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·         vaccine   [vak seen´]   A substance that contains parts of antigens from an infectious organism. When injected into the body, an immune response occurs protecting the person against later infection by that organism. For example, vaccines have been developed against polio, German measles and a host of other diseases.

·         vagus nerve   10th cranial nerve.

·         vascular   [vas´cue lur]   Relating to blood vessels.

·         vascularity   [vas ku lair´ ih tee]   The blood supply of a tumor.

·         vector   [veck´ tore]   A carrier. A mechanism for delivering therapy to the cells of a tumor.

·         ventilation   To supply air to the lungs.

·         ventricles   [ven´ trih kl]   Four connected cavities in the brain through which cerebrospinal fluid flows.

·         ventriculo-atrial shunt   [ven trik´ you low - a´ tree al]   A drainage tube that carries fluid from a ventricle in the brain and empties into the right atrium of the heart. Abbreviated VA shunt.

·         ventriculo-peritoneal shunt  [ven trik´ you low - pear ih ton ee´ al]   A drainage tube that carries fluid from a ventricle in the brain and empties into the abdominal cavity. Abbreviated VP shunt.

·         vermis   [vur´ miss]   The midline portion of the cerebellum located between the cerebellar hemispheres.

·         vertebrae   [vur´ tih bray]   The 33 bones of the spine: 7 cervical (neck area); 12 thoracic (they are attached to the ribs); 5 lumbar (lower back); 5 sacral (joined together and called the sacrum); 4 coccygeal (joined together and called the coccyx or tailbone).

·         vertigo   [ver´ tih go]   Dizziness. Symptom common to tumors of the acoustic nerve.

·         vestibular schwannoma   [ves tib´ you lar • shwah no´ ma]   A benign tumor of the nerve of hearing (the 8th cranial nerve) located in the angle between the cerebellum and the pons. Bilateral tumors may be associated with neurofibromatosis 2. Also called acoustic neuroma or acoustic neurilemmoma.

·         vinca alkaloids   Anticancer drugs that inhibit cell growth by stopping cell division. They are also called antimitotic or antimicrotubule agents, or mitotic inhibitors.

·         viscera   [viss´ ur ah]   The internal organs of the chest and abdomen.

·         visual area   Areas in the occipital lobe that are involved with vision.

·         vitamins   Substances found in various foods that are necessary for normal functioning in the body.

·         von Hippel-Lindau syndrome   A rare inherited disorder in which blood vessels grow abnormally in the eyes, brain, spinal cord, adrenal glands and other parts of the body. Those with the syndrome are at a higher risk for developing some types of cancer. Abbreviated VHL.