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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.
Ganglions are small sacs (cysts) filled with fluid that often appear as bumps on the hands and wrists. They can also develop on feet, ankles, knees, or shoulders. A ganglion can grow out of a joint capsule, which surrounds the joint, or a tendon sheath, which covers the tendon (the fibers connecting muscle to bone).Ganglions aren't cancerous. Most people with ganglions notice that the bumps appear suddenly.anglions are usually small, painless bumps and do not cause other symptoms. Sometimes the bump can be tender to the touch, or there can be pain that gets worse with activity or pressure. If the ganglion puts pressure on nearby nerves, you may have tingling in your fingers, hand, or forearm.