Spiral CAT scan
See Helical CT, Computed Tomography.
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- Spiral fracture
A fracture, sometimes called a torsion fracture, in which a bone has been twisted apart.
- Spirochete
A microscopic bacterial organism in the Spirochaeta family that has a worm-like, spiral-shaped form and wiggles vigorously when viewed under a microscope. Treponema pallidum, the cause of syphilis, is a particularly well-known spirochete.
- Spirometry
A test of the air capacity of the lung. The test utilizes a machine called a spirometer to measure the volume of air inspired and expired by the lungs.
- Spitz-Holter valve
A pioneering one-way valve created by John Holter to treat hydrocephalus. In 1955 Mr. Holter, , a hydraulics technician, and his wife had a son with hydrocephalus for which there was then no effective treatment. Mr. Holter designed a device with a tiny one-way valve that released controlled amounts of the cerebrospinal fluid from the […]
- Spleen
An organ that is located in the upper-left part of the abdomen, not far from the stomach, that produces lymphocytes, which are important elements in the immune system. The spleen is the largest lymphatic organ in the body. The spleen also filters blood, serves as a major reservoir for blood, and destroys blood cells that […]