This is an MRI image of a knee with a Baker's cyst, which the white arrows are pointing to. www.cobaltappeal.com/images/bakerscystsmall.jpg A Baker's cyst can form in a adult knee from almost any form of arthritis and cartilage tear. They can also be associated with Lyme's Disease. In children the cyst do not indicate any disease present. A Baker's cyst is swelling caused by fluid in the knee joint protruding to the back of the knee. The cyst can cause knee pain or tightness. Some cysts may cause no symptoms. The cysts can cause a visible bludge behind the knee. These cysts can be diagnosed using US, MRI, or a arthrogram. They can be treated with cortisone injections, surgery, or medications to relieve pain and swelling.
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