Dermatomyositis (DM) is a rare idiopathic inflammatory myopathy with muscle weakness and characteristic cutaneous manifestations. The disease is a rare assembly of systemic disorders in which idiopathic inflammatory myopathy (IIM) which does not affect neuromuscular transmission is associated with characteristic skin exanthema [1–3]. Today, several autoimmune disorders are subjoined to the group of DM and polymyositis, presented with cutaneous and muscle syndrome, with unclear etiology and probably different genesis. Clinical profile of DM is heterogeneous [4], and this heterogenous character of disease is supported by [5]:
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(a)
A strong association with malignancy [6, 7]
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(b)
A combination with features of other connective tissue diseases [6, 8], and a high level of autoantibodies [9]
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(c)
The existence of a separate cutaneous form without muscle damage [10]
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(d)
The absence of autoantibodies in two-thirds of patients [9]
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(e)
A different therapeutic response to immunosuppressive therapy depending upon the presence of high titers of antinuclear antibody (ANA) or myositis-specific autoantibody (MSAs) and malignancy [11, 12]
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(f)
Drug induction of clinical features of DM [13]
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(2009). Introduction. In: Dermatomyositis. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-79313-7_1
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