Category: P

A form of porphyria in which patients develop liver disease and rashes on parts of their bodies exposed to the sun (e.g., on the knuckles or face). The use of alcohol or estrogens may worsen the condition. The cause is a deficiency of uroporphylinogen decarboxylase. This condition typically arises in early adulthood. Skin sensitivity to…

Callus formation in repair of fractured bone.  

A rare skin disease marked by thickening of the stratum corneum in a linear arrangement, followed by its atrophy. Porokeratosis appears on smooth areas. It is irregular in form and size with a circumscribed outline and affects the hands and feet, forearms and legs, the face, neck, and scalp. A rare, inherited, long-lasting, and advancing…

A channel-forming protein in cell membranes that facilitates the diffusion of water and small molecules in and out of the cell.  

The phylum of sea sponges, some of which are toxic to humans.  

Inflammation of the brain with development of cavities communicating with the subarachnoid space.  

An anomalous condition in which the ventricles of the brain are connected with the subarachnoid space.  

The formation of small abscesses in the iliac lymph nodes.  

The number of organisms, usually people, living within a defined space, such as a city, county, or town. In the U.S., regions with greater population densities tend to have different health care problems than lightly populated ones. Conditions such as gunshot wounds, HIV/AIDS, and tuberculosis are more common in metropolitan areas than in rural areas.…

Any of the several plants of the genus Papaver. Opium is obtained from the juice of the unripe pods of Papaver somniferum.