Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «P»:
Pseudoparalysis, spastic: Better known as
Creutzfeldt-Jakob disease (CJD). A dementing disease of the brain.
CJD is believed to be due to
a highly unconventional transmissible agent named a prion. It is not
a bacteria, not a virus, in fact not like any other known type of
Pseudorubella: Synonymous with Roseola infantum, a
viral disease of infants sudden onset of high fever which lasts several and young children
with days and then suddenly subsides leaving in its wake a fine red rash. The causative
agent is herpesvirus type 6 so the disease is known as Sixth Disease. ...
Pseudotumor cerebri: Increased pressure within the brain in the absence of a tumor. Symptoms may include headache, nausea, vomiting, pulsating intracranial noises, singing in the ears, double vision, loss of visual accuracy, and even blindness. It is most common in women between the ages of 20 and 5...
Pseudoxanthoma elasticum: (Abbreviated PXE). A genetic disorder characterized by degeneration of elastic fibers and tiny areas of calcification in the skin, back of the eyes (retinae), and blood vessels. PXE can be inherited as an autosomal dominant or recessive trait and can occur sporadically in t...
Psittacosis (parrot fever)
Psittacosis (parrot fever): An infectious disease
due to a bacteria (Chlamydia psittaci) contracted from psittacine
birds, especially caged birds like parrots, parakeets, and lovebirds
and also in turkey processing plants.
The bacteria enter the human body by inhalation of air that
Psoas: Muscles of the lower back (the loin). There are two psoas muscles on each side of the back. The larger of the two is called the psoas major and the smaller the psoas minor.
The psoas major originates at the spine around the bottom of the rib cage and runs down to the thigh bone (the femur). T...
Psoralen: Any of a number of drugs and other substances containing chemicals that react with ultraviolet (UV) light to cause darkening of the skin....
Psoralen photochemotherapy: See: PUVA....
Psoriasis: A reddish, scaly rash often located over the surfaces of the elbows, knees, scalp, and around or in the ears, navel, genitals or buttocks. Psoriasis is an autoimmune disease that is mediated by T lymphocytes. It is also a very common disease,
Chronic plaque psoriasis affects approximate...
Psoriasis vulgaris: The medical name for the most common form of psoriasis ("vulgaris" means common). About 80% of people with psoriasis have this type. It is also called plaque psoriasis because of the characteristic plaques on the skin: well-defined patches of red raised skin that can appear on an...
Psoriasis, erythrodermic: A particularly inflammatory form of psoriasis that often affects most of the body surface. It is the least common form of psoriasis and most commonly appears on people who have unstable plaque psoriasis, where lesions are not clearly defined.
The erythrodermic form of psor...
Psoriasis, flexural: A form of psoriasis found in the armpits, groin, under the breasts and in other flexion creases (skin folds) such as those around the genitals and buttocks. This form of psoriasis appears as smooth, dry areas of skin that are red and inflamed but do not have the scaling associat...
Psoriasis, guttate: A type of psoriasis
characterized by red, scaly patches of inflamed skin on all
parts of the body. It is associated with a lung infection
in many cases....
Psoriasis, inverse: Also called flexural psoriasis, a form of psoriasis found in the armpits, groin, under the breasts and in other flexion creases (skin folds) such as those around the genitals and buttocks. This form of psoriasis appears as smooth, dry areas of skin that are red and inflamed but d...
Psoriasis, plaque: The most common form of psoriasis -- about 80% of people with psoriasis have this type. Plaque psoriasis can appear on any skin surface, although the knees, elbows, scalp, trunk and nails are the most common locations. It is characterized by well-defined patches of red raised skin...