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Edema. Edema or oedema, formerly known as dropsy or hydropsy, is an abnormal accumulation of fluid in the interstitium, which are locations beneath the skin or in one or more cavities of the body. It is clinically shown as swelling.dema or oedema, formerly known as dropsy or hydropsy, is an abnormal accumulation of fluid in the interstitium, which are locations beneath the skin or in one or more cavities of the body.
Edema is the swelling of tissues that occurs when excessive fluid accumulates within the tissue. Fluid comprised of water and electrolytes, with a very small amount of protein and other macromolecules, normally leaves capillaries and small postcapillary venules by a process called filtration.