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Ganglion Cyst Quick Overview. A ganglion cyst is a tumor or swelling (benign, not cancerous) usually on top of a joint or the covering of a tendon (tissue that connects muscle to bone). It looks like a sac of liquid (cyst) located just under the skin. Inside the cyst is a thick, sticky, clear, colorless, jellylike material.
More detail and supporting information is in the main article. 1  Ganglion cysts are non-cancerous. 2  In around half of cases, ganglion cysts will disappear without intervention. 3  Science is yet to explain how these cysts form.  The fluid within the cysts is similar to that contained within synovial joints.