Myositis

Last revised by Tariq Walizai on 4 Nov 2024

Myositis (plural: myositides) is the subset of myopathy characterised by inflammation of skeletal muscle.

Pathology

Aetiology

Myositides can be generally categorised by aetiology as follows 1:

Radiographic features

MRI is the gold standard modality for non-invasive evaluation of myositis, which shows a classic oedema signal pattern (high T2WI and STIR signal) in affected muscles. Inflamed muscles demonstrate contrast enhancement.

If chronic, T1WI will show high muscle signal indicating fat replacement and atrophy.

Cases and figures

  • Case 1: polymyositis
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