Dermatomyositis, polymyositis, and inclusion body myositis are the maj
or categories of idiopathic inflammatory myopathy. These inflammatory
myopathies are distinct clinically, histologically, and pathogenically
. Features of dermatomyositis and polymyositis can overlap with those
of other autoimmune connective tissue diseases. Ln this article, the a
uthors review the characteristic features of these myopathies, update
the recent developments in this area, and provide a framework for trea
tment.