DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Swollen knees in polyarthritis. Close-up of the swollen knees of an 82-year-old female patient with seronegative polyarthritis (polyarthropathy). Arthritis is a disease that involves inflammation of the joints. Polyarthritis is arthritis that affects 5 or more joints simultaneously.
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