The Baker’s cyst or popliteal cyst is also known as a synovial cyst. It is a soft, fluid-filled lump in the popliteal fossa behind the knee. In the back of the knee, there is synovial tissue ...

The Baker’s cyst or popliteal cyst occurs when there is too much synovial fluid within the knee as a result of increased inflammation in the knee. This fluid fills a water-filled sack in the ...