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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.
When a ganglion cyst presses on a nerve it can be painful. And depending on its location, a ganglion cyst may restrict movement. Some cysts do not need treatment, but others must be surgically removed. During a ganglion cyst removal, a doctor removes the cyst capsule or stalk to completely remove the cyst.