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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.
Often referred to as ganglion cysts, ganglia are collections of thick fluid that collect into lesions that develop on or near a joint or tendon. Typically, most examples of ganglia develop on the wrist, although there are a number of cases reported on ankles and finger joints as well. In many cases, the presence of ganglia can create joint swelling that ranges from mildly irritating to very painful.