What are idiopathic inflammatory myopathies?

Updated: Jan 05, 2021
  • Author: Mythili Seetharaman, MD; Chief Editor: Herbert S Diamond, MD  more...
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Polymyositis is one of several idiopathic inflammatory myopathies. [2] Clinically similar to polymyositis, dermatomyositis is an idiopathic inflammatory myopathy associated with characteristic dermatologic manifestations. [3] Inclusion body myositis is a slowly progressive, idiopathic, inflammatory myopathy with characteristic pathologic findings that is generally found in older men. Bohan and Peter classified the idiopathic inflammatory myopathies as follows [5] :

  • I - Primary idiopathic polymyositis

  • II - Primary idiopathic dermatomyositis

  • III - Polymyositis or dermatomyositis associated with malignancy [6]

  • IV - Childhood polymyositis or dermatomyositis

  • V - Polymyositis or dermatomyositis associated with another connective-tissue disease

  • VI - Inclusion body myositis

  • VII - Miscellaneous (eg, eosinophilic myositis, myositis ossificans, focal myositis, giant cell myositis)

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