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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

+