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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.
I take it you don't know what a ganglion cyst is either. I'll explain. The cyst isn't being tested. It's been sent to a lab to be examined and identified. A ganglion cyst is a fluid-filled sac that most commonly develops along the tendons or joints of the hand or foot.