title: Calcium pyrophosphate crystals in intermittent hydrarthrosis.
abstract: A 49-year-old female presented with intermittent hydrarthrosis affecting the right knee. Numerous calcium pyrophosphate crystals were demonstrated in synovial fluid aspirated from the knee.
mesh_terms: D002131:Calcium Pyrophosphate / Q000032:analysis*; D011756:Diphosphates / Q000032:analysis*; D005260:Female; D006801:Humans; D006833:Hydrarthrosis / Q000378:metabolism*; D007719:Knee Joint; D008875:Middle Aged; D013582:Synovial Fluid / Q000032:analysis*
chemical_list: D011756:Diphosphates; D002131:Calcium Pyrophosphate