Ganglion on the forearm of a patient. This is a cystic swelling associated with the sheath of a tendon. The swollen area, which contains the synovial fluid that lubricates tendons and joints, may vary from the size of a pea to the size of a golf ball. A ganglion may disappear spontaneously; if it becomes painful or unsightly the fluid may be sucked out with a needle or the ganglion may be removed surgically.
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