PMC6646736_01
Deltoid muscle biopsy showing myositis. (A) Hematoxylin and eosin (HE) staining: abundant inflammatory cell infiltration of muscle. (B) Cytochrome c oxidase (COX) staining. (C) Modified Gomori trichrome (MGT). (D) NADH-tetrazolium reductase staining. (E) Oil Red O (OR) staining. (F) Succinate dehydrogenase (SDH) staining.
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F1
A left deltoid muscle biopsy demonstrated perivascular inflammation with necrosis, leading to the diagnosis of inflammatory myopathy (Figure 1).