M67.4: Ganglion

A ganglion is a noncancerous lump, often likened to a balloon or sac, that typically forms along the tendons or joints of your wrists, ankles, or hands. Sometimes referred to as a "synovial cyst" or "gideon's disease," ganglions are filled with a thick, jelly-like fluid. The exact cause of a ganglion is unknown, but it often emerges following damage or irritation to the joint or tendon. The size may fluctuate, growing larger when the joint is used for repetitive motions. People affected by a ganglion might experience pain, tingling, muscle weakness, or a burning sensation, especially when the cyst presses against a nerve. However, many times, these cysts do not cause discomfort and require no treatment. If the ganglion gets larger or causes severe symptoms, medical attention may be needed.