DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Grooved nail with mucous cyst. Close-up of a groove in the finger nail of a 71-year-old male patient, caused by a mucous cyst at the base of the nail. A myxoid (or mucous) cyst is a benign fluid filled swelling that occurs on the fingers or toes.
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