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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 soft tissue lump that may occur in any joint, but most often occurs on, around, or near joints and tendons in the hands or feet. These cysts are caused by leakage of fluid from the joint into the surrounding tissue. 1 Signs and symptoms.