Inclusion Body Myositis

  • Mazen M. DimachkieEmail author
  • Richard J. Barohn
Nerve and Muscle (M Hirano and LH Weimer, Section Editors)
Part of the following topical collections:
  1. Topical Collection on Nerve and Muscle


Sporadic inclusion body myositis (IBM) is the most common idiopathic inflammatory myopathy (IIM) after age 50 years. It presents with chronic insidious proximal leg and distal arm asymmetric muscle weakness. Despite similarities with polymyositis (PM), it is likely that IBM is primarily a degenerative disorder rather than inflammatory muscle disease. IBM is associated with a modest degree of creatine kinase (CK) elevation and an electromyogram (EMG) demonstrates a chronic irritative myopathy. Muscle histopathology demonstrates endomysial inflammatory exudates surrounding and invading non-necrotic muscle fibers often times accompanied by rimmed vacuoles. We review IBM with emphasis on recent developments in the field and discuss ongoing clinical trials.


Inclusion body myositis Idiopathic inflammatory myopathies Polymyositis Pathology Pathophysiology Treatment Prognosis 



No potential conflicts of interest relevant to this article were reported.


Papers of particular interest, published recently, have been highlighted as: • Of importance •• Of major importance

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Copyright information

© Springer Science+Business Media New York 2012

Authors and Affiliations

  1. 1.Department of NeurologyUniversity of Kansas Medical CenterKansas CityUSA

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