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A: Hematoxylin and Eosin (H&E) staining. Mononuclear cell infiltration surrounding non-necrotic muscle fiber (arrow). B: H&E staining. Atrophied muscle fiber (arrow). C: Modified Trichrome-Gomori staining (TG). Rimmed vacuole (arrow). D: Cytochrome-C oxidase (CCO) staining. CCO-negative fibers (arrow). E, F: Immunohistochemistry for CD8 (E), and MHC class I (F). Bar, 50 µm.
