Abstract
Dermatomyositis (DM), in addition to polymyositis (PM) and inclusion body myositis, is categorized as an autoimmune inflammatory myopathy. This group of disorders is characterized by the notable features of symmetric proximal skeletal muscle weakness and laboratory findings consistent with muscle inflammation. DM, unique among the group of inflammatory myopathies, also exhibits a set of distinctive and bothersome cutaneous findings and may present with other systemic symptoms such as interstitial lung disease, arthritis, dysphagia, and an increased risk for internal malignancy. Classic DM presents with skin findings, proximal muscle weakness, and laboratory or radiologic evidence of myositis. When DM occurs in the complete absence of muscular symptoms and muscle inflammation, it is known as amyopathic DM (formally DM sine myositis). The presence of DM-related skin signs with subclinical myopathy and borderline evidence of muscle inflammation is known as hypomyopathic DM [1].
P. B. Chansky and L. Mittal are first coauthors of this chapter.
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Chansky, P.B., Mittal, L., Sunderkötter, C., Werth, V.P. (2018). Dermatomyositis. In: Orfanos, C., Zouboulis, C., Assaf, C. (eds) Pigmented Ethnic Skin and Imported Dermatoses. Springer, Cham. https://doi.org/10.1007/978-3-319-69422-1_31
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