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A ganglion is a fluid-filled swelling of the lining of a joint or tendon. Although ganglions can form on any part of the foot, they most often appear on the ankle or top of the foot. Ganglions tend to change size and usually grow slowly.
What are ganglion cysts? A ganglion, ganglion cyst, or synovial cyst, is a swelling filled with fluid near a joint or tendon, such as the wrist, hand or fingers. The swelling looks like a smooth soft lump under the skin and can range from pea-sized to being as big as a golf ball in some cases.