DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Recurrent ganglion on the thumb of a 52-year-old woman. This condition arises due to a cystic swelling associated with the sheath of a tendon. It is fairly common, occurring on the wrist or on a foot or digit, as seen here. The swelling contains the thick synovial fluid that usually lubricates tendons and joints. A ganglion may disappear spontaneously or be treated, if painful or unsightly, by sucking out the fluid with a syringe. However, ganglia frequently recur after such treatment, as has occurred here. Surgical removal is a more successful solution.
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