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Baker's cyst

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Introduction
A Baker's cyst, also called a popliteal cyst, is a fluid-filled swelling that develops at the back of the knee. It is caused by a problem with the knee joint or the tissue behind it.
Treating Baker's cyst
You can treat a Baker's cyst yourself at home. Further treatment is only needed if the cyst stops you using your knee properly or causes pain that doesn't go away.