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Epidemiology of Dermatomyositis

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Dermatomyositis

The idiopathic inflammatory myopathies are relatively rare diseases that occur throughout the world. The occurrence of DM/PM is uncommon. The absence of reliable epidemiologic data for DM is rather surprising and may relate to several reasons: (i) the rarity of disease, (ii) the lack of consistent use of diagnostic criteria, (iii) the indolent clinical course, (iv) the fact that the numbers result from studies on hospitalized patients, (v) the management of outpatients by physicians from many different specialties (including pediatric and adult rheumatologists, neurologists, dermatologists, other specialists, and general practitioners), and (vi) the lack of prospective studies of associated myositis in connective tissue disease [1].

Dermatomyositis affects both children and adults. The incidence of DM is approximately 10–20 times lower than the incidence of lupus erythematosus, or other connective tissue diseases — systemic sclerosis or rheumatoid polyarthritis [2, 3]. The relative prevalence of DM in relation to PM varies between different studies.

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(2009). Epidemiology of Dermatomyositis. In: Dermatomyositis. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-79313-7_5

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