Polymyositis and dermatomyositis MRI

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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]

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 an active disease and muscle edema
  • Fatty infiltration of muscles
  • Muscle calcification

MRI (sagittal STIR) of the cervical spine demonstrates diffuse hyperintensity of the paravertebral muscles. Case courtesy of Dr Daniela Seixas
via Radiopaedia.org