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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.
A ganglion cyst is a fluid-filled bump that forms under the skin near a joint, most commonly in the wrist area, and sometimes in the shoulder, elbow, hip, knee, ankle, or foot regions. The conventional medical view of ganglion cysts is that they are idiopathic, meaning that definitive causes are not known.