Abstract
Idiopathic inflammatory myopathies (IIM) are a heterogeneous group of autoimmune disorders classically characterized by proximal skeletal muscle inflammation leading to weakness, but they often possess additional systemic manifestations such as cutaneous, pulmonary, and articular disease.1 Although originally dichotomized as either dermatomyositis (DM) or polymyositis, the discovery of new myositis-specific antibodies (MSA) and myositis-associated antibodies has led to the delineation of more refined IIM patient subgroups.
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