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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.
Ganglion Cysts. A ganglion, or cyst, is a collection of fluid that builds up on either the back or the front of the wrist. Usually it is an âoutpouchingâ of the wrist capsule, forming a bump or lump on the wrist.