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contentuptodate· Content· item f0_63_1023

©2013 UpToDate ® Print Email Calcium pyrophosphate crystals in synovial fluid An intracellular calcium pyrophosphate crystal is shown, which is pale blue when aligned with the axis of the compensator on polarized light microscopic examination. Note the rhomboid shape of the calcium-pyrophosphate crystal. Courtesy of H Ralph Schumacher, MD, and Tim Jansen, MD.