A Baker's cyst, also known as a popliteal cyst, is a pocket of joint fluid that forms a lump behind the knee. Often a Baker's cyst is painless, but occasionally this pocket of fluid can tear open and drain into the tissues of the lower leg, causing pain and swelling.
Swelling behind the knee that may increase when a person stands.
Discomfort behind the knee and into the upper calf, especially when the knee is completely bent or straight.
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