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Classification of vasculitis: EMA classification using CHCC 2012 definitions
  1. Rita Abdulkader1,
  2. Suzanne E Lane2,
  3. David G I Scott3,
  4. Richard A Watts2,3
  1. 1Department of Rheumatology, Norfolk and Norwich Hospital University Foundation NHS Trust, Norwich, UK
  2. 2Department of Rheumatology, Ipswich Hospital NHS Trust, Ipswich, UK
  3. 3Norwich Medical School, University of East Anglia, Norwich, UK
  1. Correspondence to Dr Richard A Watts, Department of Rheumatology, Ipswich Hospital NHS Trust, Heath Road, Ipswich IP4 5PD, UK; richard.watts{at}

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The classification of the antineutrophil cytoplasmic antibody (ANCA) associated vasculitides (granulomatosis with polyangiitis (Wegener's) (GPA), eosinophilic granulomatosis with polyangiitis (Churg Strauss) (EGPA), and microscopic polyangiitis (MPA)) and polyarteritis nodosa (PAN) remains contentious.1 The American College of Rheumatology (ACR) 1990 classification criteria do not include MPA or use ANCA, while the Chapel Hill Consensus Conference (CHCC) definitions (1994) did not include ANCA and although not intended to be used in classification, are widely used for that purpose.2 In order to harmonise the use of the two systems for epidemiological studies, a consensus algorithm for the classification of ANCA vasculitis and PAN was …

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