torticollis

torticollis The most common of the focal dystonias, a state of excessive or inadequate muscle tone in the muscles in the neck that control the position of the head. Torticollis can cause the head to twist and turn to one side. The head may also be pulled forward or backward. Torticollis can occur at any…

TORCH screen

TORCH screen A blood test that is designed to screen for a group of infectious agents known by the acronym TORCH, which stands for Toxoplasma gondii, other viruses (HIV, measles, and so on), rubella (German measles), cytomegalovirus, and herpes simplex. All these infectious agents are teratogens (agents that are capable of causing birth defects). The…

topical

topical Pertaining to a particular surface area. For example, a topical agent is applied to a certain area of the skin and is intended to affect only the area to which it is applied. Whether its effects are indeed limited to that area depends on whether the agent stays where it is put or is…

tophus

tophus A nodular mass of uric acid crystals. Tophi are characteristically deposited in different soft tissue areas of the body in chronic (tophaceous) gout. Even though tophi are most commonly found as hard nodules around the fingers, at the tips of the elbows, and around the big toe, they can appear anywhere in the body….