PMID: 11907509Mar 22, 2002Paper

Amyopathic dermatomyositis: retrospective review of 37 cases

Journal of the American Academy of Dermatology
Rokea A el-Azhary, Soheil Y Pakzad

Abstract

Criteria for diagnosis of amyopathic dermatomyositis vary, and the prognosis is not clear. Our purpose was to investigate prognosis regarding progression to myositis and associated malignancy. We reviewed the medical records of patients with dermatomyositis evaluated at our institution from 1976 to 1994. Of 746 patients with dermatomyositis, 37 (5%) with the amyopathic subtype were divided into 3 groups: group 1 (73%), no subjective or objective evidence of myopathy; group 2 (13%), no subjective muscle weakness but abnormalities detected by objective tests; group 3 (13%), subjective muscle weakness but no objective evidence of myopathy. Follow-up was conducted by means of a mailed questionnaire. For 25 patients, follow-up of 1 to 17 years after diagnosis showed muscle weakness in 2 patients in group 1 within 5 years after diagnosis. Five patients (13%) had associated malignancies. Of 7 (19%) patients with disease onset before the age of 18 years, none had progression to myopathy. Although it presents with cutaneous lesions indistinguishable from those of classic dermatomyositis, amyopathic dermatomyositis is a distinct entity. In most patients, amyopathic dermatomyositis does not progress to myopathy. Prognosis appears favorabl...Continue Reading

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