Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «V»:
Vampire children: Perjorative term for children with xeroderma pigmentosum, a genetic disease with such extraordinary sensitivity to sunlight that ordinary sun exposure results in the development of skin cancer at a very early age. Children with xeroderma pigmentosum (XP) can only play outdoors safe...
Van der Woude syndrome
Van der Woude syndrome: A genetic disorder characterized by pits of the lower lip and by cleft lip and/or cleft palate. It is the most common known cleft syndrome.
The van der Woude syndrome is highly variable in its expression from person to person. There may be cleft lip, cleft palate, or both. ...
Vanishing bone syndrome
Vanishing bone syndrome: An inherited form of osteolysis -- the destruction of bone. There are several such syndromes. In one form of vanishing bone syndrome, there is osteolysis in the hands and feet, crippling arthritic changes in the hands, marked osteoporosis, and nodules beneath the skin of the...
Vanishing lung syndrome
Vanishing lung syndrome: A radiological syndrome in which the lungs appear to be disappearing on X-ray. The syndrome is characterized by a progressive decrease in
the radiographic opacity of the lung. Causes include the accelerated progression of emphysema destroying the lung or the rapid cystic ...
Vanishing twin: A twin detected in early pregnancy that is miscarried, frequently by resorption, without clinical signs or symptoms. The surviving twin continues to grow and develop. Of all twin pregnancies, 40% involve a vanishing twin and result in the birth of a single child.
There is a gene ...
VAQTA: A vaccine against hepatitis A made of killed
hepatitis A virus to stimulate the body's immune system to produce antibodies against
the hepatitis A virus. ...
Vara: See: Varus....
Varco: See: Varco, Richard L....
Varco, Richard L.
Varco, Richard L.: Innovative American surgeon (1912-2004) who helped perform the first successful open heart operation. On Sept. 2, 1952 at the University of Minnesota. Dr. Varco's team, led by Dr. C. Walton Lillehei and Dr. F. John Lewis, cut off the flow of blood to the heart after lowering the ...
Variant angina: Chest pain due to coronary artery
spasm, a sudden
constriction of a coronary artery (one of the vessels that
supply the heart
muscle with blood rich in oxygen) depriving the heart
muscle (myocardium) of
blood and oxygen. This is also called Prinzmetal angina.
Variant Creutzfeldt-Jakob disease
Variant Creutzfeldt-Jakob disease: Abbreviated vCJD. A human disease thought due to the same infectious agent as bovine spongiform encephalopathy (BSE), or mad cow disease. Both the human and bovine disorders are invariably fatal brain diseases with unusually long incubation periods measured in year...
Variation, observer: Failure by the observer to measure accurately, resulting in error.
Observer variation may be due to the observer's missing a measurement, making an incorrect measurement, or misinterpreting data.
Inter-observer variation is the amount of variation between the results obtained...
Varicella (chickenpox): A highly
infectious viral disease, known familiarly as chickenpox. (In many countries, this disease is always called "varicella.")
Chickenpox has nothing at all to do with chicken. The name was meant to distinguish this "weak" form of the pox from smallpox. "Chic...
Varicella immunization: See Chickenpox immunization....
Varicella rash: Varicella (chickenpox) is characterized by a rash, often the first sign of the disease. The
rash of chickenpox develops in crops with raised red spots arriving
first, progressing to blisters that burst, creating open sores,
before crusting over. This process usually starts on the...