Stalk

A stem. Usually refers to the pituitary stalk that connects the pituitary gland to the hypothalamus. A stem. Usually refers to the pituitary stalk that connects the pituitary gland to the hypothalamus.

Stent

Device used to maintain a bodily orifice or cavity during skin grafting, or to immobilize a skin graft after placement. Slender thread, rod, or catheter, lying within the space in the interior of a tubular structure, such as an artery or the intestine. Used to provide...

Stereotactic Radiosurgery

A radiation therapy technique that uses a large number of narrow, precisely aimed, highly focused beams of ionizing radiation. The stereotactic radiosurgery beams are aimed from many directions circling the head, and meet at a specific point. Stereotactic radiosurgery...

Steroids

See glucocorticosteroids. Also called: Corticosteroids, Glucocorticoids. Anabolic steroids can have harmful effects, but corticosteroids treat a variety of problems. Corticosteroids steroids are similar to hormones that the adrenal glands produce to fight stress...

Stroke

The sudden development of localized disturbances in the nervous system, usually related to reduced blood in the brain. A stroke occurs when the blood supply to part of the brain is suddenly interrupted or when a blood vessel in the brain bursts, spilling blood into...