Category: C

An area on a nuclear medicine scan in which no radioactive tracer is taken up, indicative of nonfunctioning tissue in a gland or other structure.  

A red spot occurring on the retina in children with Tay-Sachs disease. In infants afflicted with the hereditary metabolic condition known as Tay-Sachs disease, a crimson mark becomes visible upon the retina.  

A splint constructed around an injured bone to reduce the potential for flexion contractures.  

A static splint designed to maintain the wrist in either extension or flexion.  

A small splint adjusted about a fractured part to prevent overriding of the fragments of bones; usually covered by a longer splint for fixation of entire section.  

A steel bridge with wings connected by a hinge; used for operation of a depressed nasal bridge.  

A splint composed of a metal structure placed posterior to the thigh and leg.  

Enlargement of the spleen caused by various types of venous congestion: splenic vein obstruction, systemic venous congestion (e.g., due to heart failure), or portal vein hypertension caused by cirrhosis of the liver. Blood flow through the spleen is slowed, increasing red blood cell destruction by macrophages (hypersplenism) and resulting in focal hemorrhages.  

An excementosis or pointed protuberance extending from the surface cementum of a tooth root.  

The portion of the spectrum that produces visible light. Wavelengths of about 3900 A to 7700 A are visible.