Myositis is the subset of myopathy characterized by inflammation of skeletal muscle.



Myositides can be generally categorized by etiology as follows :

Radiographic features

MRI is the gold standard modality for noninvasive evaluation of myositis, which shows classic edema 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.

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