Baker Cyst
A Baker's cyst is an abnormal swelling of a bursa (a fluid-filled sac) behind the knee.

No one really knows what causes a Baker's cyst. However, a cyst can occur when the lining of the knee joint produces too much fluid after an injury or in certain kinds of arthritis.

Symptoms of Baker's Cyst
You may have pain, swelling, or a feeling of fullness in the area behind the knee.
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