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 BOF 196

 

   

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BOF 196
In polymyositis and dermatomyositis, all are true, except:
1-proximal muscle weakness is very common while facial weakness is seen only in 5 % of cases and extra ocular muscle involvement in 2 % of cases only
2-dermatomyositis muscle biopsy shows characteristic perifasicular atrophy due to capillaritis
3-CPK is usually normal
4-childhood type carries a poor prognosis as there is an associated visceral vasculitis
5-EMG may show pseudo myotonia pattern

 

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