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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 a condition of abnormally large fluid volume in the circulatory system or in tissues between the body's cells (interstitial spaces). Normally the body maintains a balance of fluid in tissues by ensuring that the same of amount of water entering the body also leaves it.