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Table 1 Criteria for diagnosis of polymyositis in childhood (3 out of 4 required) [9].

From: Polyomyositis and myocarditis associated with acquired toxoplasmosis in an immunocompetent girl

  POLYMYOSITIS
Symmetrical proximal muscle weakness +
Elevated muscle derived enzymes +
Muscle histopathology +
Electromyographic changes: inflammatory myopathy +