Skip to Main Content


This chapter focuses on the major types of inflammatory myopathies (IM), including dermatomyositis (DM), polymyositis (PM), immune-mediated necrotizing myopathy (IMNM), antisynthetase syndrome (ASS), and inclusion body myositis (IBM) (Table 358-1). Other IM include those caused by infection, eosinophilic myositis and granulomatous myositis. Of note, inflammatory cell infiltrates can also be occasionally seen in muscle biopsies in hereditary (e.g., muscular dystrophies, metabolic myopathies) and toxic myopathies.

TABLE 358-1Inflammatory Myopathies: Clinical and Laboratory Features

Epidemiological studies suggest that the incidence of IM grouped together is greater than 4 cases per 100,000 with ...

Pop-up div Successfully Displayed

This div only appears when the trigger link is hovered over. Otherwise it is hidden from view.