Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «T»:
Tinea capitis: A superficial fungus infection of the skin, affecting the scalp. Also known as ringworm.
This disorder occurs most commonly in children, especially those in late childhood and adolescence. It can spread in schools.
Tinea capitis appears as scalp scaling that is associated with bald sp...
Tinea cruris: A superficial fungus infection of the crotch and perineum known popularly as jock itch.
Good general hygiene helps prevent it, as does keeping the area clean and dry . Laundering underwear and athletic supporters frequently also helps, as do an antifungal or drying powder after bathin...
Tinea incognito: Tinea corporis, a common fungal infection of the skin, better known as ringworm, whose appearance has been modified by the application of high-potency topical steroids in a way that renders it no longer visually diagnostic.
Tinea incognito usually presents as nonspecific inflammato...
Tinea unguium: The most common fungus infection of
the nails, also called onychomycosis.
Onychomycosis makes the nails look white and opaque, thickened,
and brittle. Those at increased risk for developing onychomycosis
People with diabetes;
People with disease of the small blood vess...
Tinel's sign: An examination test that is used by doctors to detect an irritated nerve. Tinel's sign is performed by lightly banging (percussing) over the nerve to elicit a sensation of tingling or "pins and needles" in the distribution of the nerve.
For example, in a person with carpal tunnel syndr...
Tinnitus: "Ringing in the ears" or another noise that seems to originate in the ears or head.
Tinnitus is due to diverse causes including ear infections, fluid in the ears, Meniere syndrome, medications such as aspirin and other nonsteroidal antiinflammatory drugs (NSAIDs), aging, and ear trauma fr...
TIPS stands for "transjugular, intrahepatic, portosystemic shunt." It is a shunt (tube)
placed between the portal vein which carries blood from the intestines to the
liver and the hepatic vein which carries blood from the liver back to the heart. It is used primarily (but not exclusively) in...
Tired: A feeling of a lessened capacity for work and reduced efficiency of accomplishment, usually accompanied by a sense of weariness and fatigue.
Tiredness is not a singular symptom that defines any one particular disease. Rather, tiredness can be a symptom of many different diseases and conditio...
Tiredness: See: Tired....
Tissue: A tissue in medicine is not like a piece of
tissue paper. It is a broad term that is applied to any group of
cells that perform specific functions. A tissue in medicine need not
form a layer. Thus,
The bone marrow is a tissue;
Connective tissue consists of cells that make up fibers in
Tissue plasminogen activator
Tissue plasminogen activator: (tPA) An enzyme that helps dissolve clots. tPA is made by the cells lining blood vessels and has also been made in the laboratory. It is systemic thrombolytic (clot-busting) agent and is used in the treatment of heart attack and stroke. Activase (alteplase) is a tissue ...
Tissue, connective: See: Connective tissue....
Tissue, lymphoid: A part of the body's immune system that helps protect it from bacteria and other foreign entities.
Lymphoid tissue is rich in lymphocytes (and accessory cells such as macrophages and reticular cells). The lymphoid tissue includes the lymph nodes, spleen, tonsils, adenoids and the t...
Titer: The degree of dilution of a substance such as an antibody, reflecting the strength of the solution.
The English spell it "titre," French for "title," derived from the Latin "titulus," an inscription or label. The "titre" was evidence of the fineness of an alloy of gold or silver....
Titin: A giant filamentous protein essential to the structure, development, and elasticity of muscle. The gene encoding titin is mutated in tibial muscular dystrophy....