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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 accumulation of abnormal levels of fluid in the circulatory system and the tissues between the bodyâs cells (interstitial tissue).This condition often causes tissue underneath the skin to swell, and is common when lymphatic blockage occurs.his excess fluid gets trapped in the bodyâs tissue in a greater capacity than the lymphatic system can eliminate. Generally, edema is physically unnoticeable until the interstitial fluid volume is approximately 30% above normal (normal fluid volume is 10%).