Polymyositis and dermatomyositis MRI

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Polymyositis and dermatomyositis Microchapters

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Sadaf Sharfaei M.D.[2]

Overview

MRI

  • MRI from muscles may be helpful in the diagnosis of polymyositis and dermatomyositis.
  • MRI is required for follow-up, and to identify the best site for muscle biopsy.
  • Findings on MRI suggestive of polymyositis and dermatomyositis include:
    • Areas of high signal intensity reflecting active disease and muscle edema
    • Fatty infiltration of muscles
    • Muscle calcification

References