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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 an abnormal accumulation of fluid beneath the skin or in one or more cavities of the body that produces swelling. Edema is caused by increased secretion of fluid into the interstitium or impaired removal of this fluid.