DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Ganglion cyst. Close-up of a ganglion cyst on the wrist of a 90-year-old female patient. Ganglion cysts are a type of cyst (fluid filled sac) named for their similarity to the appearance of ganglion nerve clusters. Their cause is unknown, but may result from overuse of the joint, causing the degeneration of the surrounding fibrous tissue and the development of a fluid-filled cystic structure. The cysts are usually asymptomatic, but may be removed surgically for cosmetic reasons.
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