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Diagnostic criteria

Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

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A diagnosis of dermatomyositis requires that five features are present:

  • proximal, symmetric muscle weakness
  • muscle biopsy evidence of myositis
  • elevation of serum muscle enzymes
  • characteristic electromyographic abnormalities
  • compatible skin involvement

Polymyositis requires only four features, there being no skin involvement.

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