Abstract
MICBOSCOPICAL examination of synovial fluid for identification of crystals is frequently performed for the diagnosis of gout or pseudogout (chondrocalcinosis). Problems may arise in the differentiation of the sodium urafe from calcium pyrophosphate crystals1 or in distinguishing cholesterol crystals that may be seen in rheumatoid arthritis2 and fibrillar cartilage material in degenerative arthritis.3 Crystals formed from oxalate used as an anticoagulant for the synovial fluid can also be a source of confusion, as noted by Gatter and McCarty4 in a paper published in England, but this possibility has not been widely recognized. This report describes the detection of such oxalate . . .

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