Gout tophi on an 72-year-old man's finger. Gout is a disorder of uric acid metabolism by the kidneys. It can result in deposits of monosodium urate cr

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Gout tophi on an 72-year-old man's finger. Gout is a disorder of uric acid metabolism by the kidneys. It can result in deposits of monosodium urate crystals in synovial joints and nearby connective tissues. The deposition of crystals causes local inflammatory swellings (tophi, centre) that are extremely painful. Treatment is with anti-inflammatory drugs and changes in diet.

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Photo credit: © DR P. MARAZZI/SCIENCE PHOTO LIBRARY / Alamy / Afripics
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