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.

The result is a Baker’s, or popliteal, cyst. Although these cysts usually are not dangerous, they may be accompanied by uncomfortable symptoms, including swelling, pain and stiffness in the knee.

How long will this last? What can be done?" A Baker's cyst is a sac filled with fluid located behind the knee. They're quite common, typically affecting people between the ages of 35 and 70.

Baker’s cysts aren’t dangerous and may go away on their own. But if a Baker’s cyst causes discomfort or interferes with normal activities, there are several things you can do.

Baker's cysts are caused by anything that causes a swelling of the joint; in particular, the most common cause is osteoarthritis. Another name for this is degenerative arthritis.

News National News Baker’s cyst may be result of another underlying condition By Morning Call | Staff Report PUBLISHED: October 31, 2012 at 5:00 a.m. | UPDATED: August 22, 2019 at 11:37 a.m.