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Table 1 Diagnostic criteria of polymyositis and dermatomyositis, according to Bohan and Peter [4, 5].

From: Dermatomyositis masquerading as pulmonary embolism

1. Progressive symmetrical general muscle weakness
2. Typical for myositis histopathology findings
3. Elevated plasma level of CK and/or aldolase
4. EMG findings typical for primary myopathy
5. Typical skin findings (Gottron's sign, helitrope rash of eyelids, upper torso, arms)
Number of symptoms 5
Diagnosis Confirmed Suggestive Possible
PM 4 3 2
DM 3-4 2 1
plus characteristic skin findings