Idiopathic inflammatory myopathies (symptoms, diagnosis, treatment, classification)

Idiopathic inflammatory myopathies (IIM) are a collective name for a heterogeneous group of disorders, characterized by inflammatory changes in the muscles and other tissues.

Classification

IIM can be classified into 4 groups:

• Dermatomyositis (DM)
• Overlap myositis (OM)
• Inclusion body myositis (IBM)
• Necrotizing autoimmune myopathy (NAM)

Some authors refer to polymyositis (PM) as a member of IIM, while others describe it as a CTD-associated myositis.

Clinical presentation

• All of the IIMs except for IBM present with proximal muscle weakness with elevated CK levels.
• IBM presents

Classification

Clinical presentation

Symptoms and additional information

Dermatomyositis

Overlap myositis

Inclusion body myositis

Necrotizing autoimmune myopathy

Diagnosis

Treatment

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