multiple sclerosis

Multiple Sclerosis (MS) Glossary

Glossary - Pi - Pz

• pleural effusion - abnormal accumulation of fluid between the layers of the membrane that lines the lungs and chest cavity
• pneumonia - an infection of the lung characterized by inflammation; usually caused by a pathogen such as a bacteria or virus
• pneumothorax - abnormal accumulation of air or gas in the pleural space (the space surrounding the lungs)
• polyuria - excessive urine production; usually pale and dilute; often a symptom of diabetes
• postural hypotension - sudden decrease in blood pressure upon standing, usually causing temporary dizziness or blackout
• proctitis - inflammation of the rectum or anus; marked by bloody stools and a frequent urge to defecate; often associated with Crohn's disease or ulcerative colitis
• psoriasis - chronic skin disease characterized by dry red patches covered with scales
• psychosis - any severe mental disorder in which contact with reality is lost or is highly distorted
• ptosis - drooping of a muscle; usually applied to drooping of the upper eyelid caused by muscle paralysis and weakness
• pulmonary embolus - blockage of an artery in the lungs by fat, air, tumor tissue, or blood clot