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Baker's cyst. Swollen leg of a male patient with a Baker's, or popliteal, cyst, a fluid-filled lump behind the knee (at left). It is caused by the build-up of pressure within the knee joint and is often a complication of a disorder such as rheumatoid arthritis. The cyst can rupture, causing great pain. Treatment is with drainage of the fluid and anti-inflammatory drugs.
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