Dermatomyositis (DM) is a rare chronic idiopathic inflammatory myopathy, characterized by symmetrical proximal muscle involvement and typical skin lesions. The incidence is approximately 5/1,000,000 population. DM occurs in all races, twice as often in females. It is also not rare in childhood, when it is known as juvenile dermatomyositis (JDM). In about 10% of patients the cutaneous changes characteristic of DM are not associated with muscle disease (amyopathic DM). DM of adults is associated in about 3o% of patients with internal malignancies. The immunogenetics of DM is not homogeneous.
KeywordsIdiopathic Inflammatory Myopathy Juvenile Dermatomyositis Internal Malignancy Cutaneous Change Muscle Enzyme Level
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