Baker's cyst is a buildup of joint fluid (synovial fluid) that forms behind the knee.
Popliteal cyst; Bulge-knee
A Baker's cyst is caused by swelling in the knee. The swelling is due to an increase in synovial fluid - the fluid that lubricates the knee joint. When pressure builds up, fluid bulges into the back of the knee.
Baker's cyst commonly occurs with:
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