What is edema?

Edema is swelling of any part of the body due to collection of fluid in the intercellular spaces of tissues.
angioneurotic e. Recurrent local edema due to increased vascular permeability of allergic or nervous origin; affecting most commonly the eyelids, lips, tongue, lungs, larynx, or extremities and occurring in persons having a variety of allergies.
Berlin’s traumatic e. Edema of the macular area of the retina, giving it a white appearance, caused by a severe blow to the eyeball.
brawny e. See nonpitting edema.
cardiac e. Edema caused by heart disease with resulting increase in venous pressures.
cerebral e. Edema of the brain caused by tumors, infarction, generalized edema due to heart or kidney disease, or certain toxic conditions.
dependent e. Swelling of the limbs, especially the legs due to accumulation of fluid.
hereditary angioneurotic e. A condition inherited as an autosomal dominant
trait, characterized by recurrent attacks of angioedema with involvement of the gastrointestinal tract and the larynx; due to deficiency of C1 esterase inhibitor or to an inactive form of the inhibitor.
high altitude pulmonary e. An acute form of altitude sickness causing edema
of the lungs.
menstrual e. Increase in weight and retention of water during or just before menstruation.
e. neonatorum A generalized, usually fatal, edema in the newborn.
nonpitting e. Edema that does not produce indentations by pressure; usually seen in metabolic abnormalities.
nutritional e. Swelling caused by prolonged dietary deficiency; usually due at least in part to hypo-proteinemia.
pitting e. Condition in which pressure on an edematous area causes indentations that remain for a time after the pressure is released.
pulmonary e. Escape of fluid into the air sacs and interstitial tissue of the lungs;
causes include left ventricular failure, mitral stenosis, and chemicals that are pulmonary toxins.

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