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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 foot cyst is a swollen pocket of tissue comprised of thick gel-like liquid that typically develops on the top of the foot. It may appear similar to a small tumor, but it is not cancerous and is often the result of foot strain or injury. Although some cysts grow slowly over time, others may develop suddenly.