DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Close-up of a ganglion on the wrist of a 73 year old female patient. This lump is a type of cyst, named for its similarity to ganglion nerve clusters. Most often found around the wrist joint, they result from overuse of a joint causing a fluid-filled cyst to form.
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