SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY
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Ganglion cyst on the ankle of a male patient. This cyst (fluid filled sac) is named for its similarity to ganglion nerve clusters. Its cause is unknown, but it may result from overuse of a specific 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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