Abstract
Idiopathic inflammatory myopathies (IIM) are a heterogeneous group of disease with complex clinical features. It has been sub-classified as: (1) Dermatomyositis, (2) Polymyositis, and (3) Inclusion body myositis (IBM). Nowadays, there are some studies in literature suggest necrotizing autoimmune myopathy and immune-mediated necrotizing myopathy should also be added to this group of disease. There is a debate in the diagnosis of IIMs and up until now, about 12 criteria systems have been proposed. Some of the criteria systems have been used widely such as Griggs et al.’s proposal for IBM. Clinical findings, autoantibodies, enzymes, electrophysiological, and muscle biopsy findings are diagnostic tools. Because of diseases’ complexity, none of the findings are diagnostic alone. In this study, we discussed the diagnostic criteria of IMMs and described detailed morphological features.
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