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| AuthorsMichael A Becker, MDLawrence M Ryan, MD | Section EditorH Ralph Schumacher, MD | Deputy EditorJerry M Greene, MD |
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INTRODUCTION
Precipitation of crystals of calcium pyrophosphate dihydrate (CPPD) in connective tissues may be asymptomatic or associated with several clinical syndromes. These disorders comprise the spectrum of calcium pyrophosphate crystal deposition disease [1-3]. Alternative names representing specific clinical or radiographic features have retained some popularity, but are of limited applicability. These include pseudogout, chondrocalcinosis, and pyrophosphate arthropathy:
The clinical manifestations and diagnosis of CPPD crystal deposition disease are discussed here. The pathogenesis and etiology of this disorder and treatment of CPPD deposition diseases, including pseudogout, are discussed separately. (See "Pathogenesis and etiology of calcium pyrophosphate crystal deposition disease" and "Treatment of calcium pyrophosphate crystal deposition disease".)
CLINICAL MANIFESTATIONS
A clinical classification of CPPD crystal deposition disease has emerged from the studies of McCarty [1] and colleagues [2,3]. This classification draws particular attention to the capacity of this disorder to mimic virtually any type of arthritis. The clinical spectrum of CPPD crystal deposition disease includes:
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