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Figure 1: Photomicrographs show (a and b) dermatomyositis with PFA, H and E ×20 (a) and perivascular inflammation, hematoxylin and eosin (H and E) ×40 (b); (c and d) Polymyositis with endomysial inflammation, H and E ×40 (c); inflammation around nonnecrotic fibers, H and E ×100 (d); (e and f) immune-mediated necrotizing myopathy, myophagocytosis, H and E ×400 (e); necrotic muscle fibers, H and E ×400 (f); (g) non-specific myositis with perivascular inflammation, H and E ×100

Figure 1: Photomicrographs show (a and b) dermatomyositis with PFA, H and E ×20 (a) and perivascular inflammation, hematoxylin and eosin (H and E) ×40 (b); (c and d) Polymyositis with endomysial inflammation, H and E ×40 (c); inflammation around nonnecrotic fibers, H and E ×100 (d); (e and f) immune-mediated necrotizing myopathy, myophagocytosis, H and E ×400 (e); necrotic muscle fibers, H and E ×400 (f); (g) non-specific myositis with perivascular inflammation, H and E ×100