Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «P»:
PMDD: see premenstrual dysphoric disorder....
PML: Stands for progressive multifocal leukoencephalopathy, a rapidly progressive, often fatal viral infection of the brain. Commonly abbreviated as PML.
PML is believed to be due to the Jacob-Creutzfeldt (JC) papovavirus. The virus infects oligodendrocytes (support cells in the brain).
The signs an...
PMLD: Pelizaeus-Merzbacher-like disease....
PMR (Polymyalgia Rheumatica)
PMR (Polymyalgia Rheumatica): A disorder of the muscles and
joints of older persons characterized by pain and stiffness, affecting both sides of the
body, and involving the shoulders, arms, neck, and buttock areas. ...
PMS (PreMenstrual Syndrome)
PMS (PreMenstrual Syndrome): See Premenstrual syndrome....
PNET: Primitive neuroectodermal tumor. One of a remarkable group of tumors that originate in cells from the primitive neural crest and share the same reciprocal translocation between chromosomes 11 and 22 and the same patterns of biochemical and oncogene expression. Some PNETs occur in the brain wh...
Pneuma: The life-giving principle. According to the school of medicine in ancient Alexandria, life was associated with a vapor called the pneuma. The belief in pneuma was called pneumatism. In hindsight, pneumatism was an early attempt to explain respiration which is, indeed, the life-giving princip...
Pneumatic larynx: A device that uses air to produce
sound, helping a person whose larynx has been removed to talk....
Pneumatism: See: Pneuma....
Pneumo-: Prefix pertaining to breathing,
respiration, the lungs, pneumonia, or air....
Pneumococcal immunization: Vaccination to help prevent infection by Streptococcus pneumoniae, also known as the pneumococcus bacterium.
This bacterium causes one of the most common and severe forms of pneumonia. To prevent this form of pneumonia, a vaccine has been offered to people over 55 and anyo...
Pneumococcus (Streptococcus pneumoniae)
Pneumococcus (Streptococcus pneumoniae): A type of bacterium that comes in pairs and is shaped like a lancet (a surgical knife with a short wide two-edged blade).
Pneumococcus is the leading cause of bacterial pneumonia and otitis media (middle ear infections) and an important contributor to bacter...
Pneumoconiosis: The deposition of particulate matter such as
asbestos and silicon in the lungs. See also: Black lung disease...
Pneumoconiosis, coal miner's
Pneumoconiosis, coal miner's: See: Black lung disease....
Pneumocystis: Pneumocystis jiroveci (previously classified as Pneumocystis carinii), the fungus that causes pneumocystis pneumonia (PCP). Pneumocystis jiroveci is found worldwide, in humans and animals. Serologic evidence indicates that most healthy children have been exposed to it by age 3 to 4. ...