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What is a ganglion?
A ganglion is a sac-like swelling or cyst formed from the tissue that
lines a joint or tendon. The tissue, called synovium, normally
functions to produce lubricating fluid for these areas. A ganglion
is a cyst formed by the synovium that is filled with a thick jelly-like fluid. While ganglia can follow local trauma to the tendon or
joint, they usually form for unknown reasons. Occasionally, ganglia
are early signs of arthritis that will become more obvious in the future.