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(a) Preserved fascicular architecture (H and E, ×40); (b and c) perifascicular atrophy (black arrow) (H and E, ×200); (b) inset– normal endomyseal collagen (Masson Trichrome, ×200); (d) perimyseal perivascular lymphocytic infiltrate (black arrow) (H and E, ×200); (e) endomyseal perivascular lymphocytic infiltrate (black arrow) (H and E, ×200); (f) basophilic regenerating myofibre (black arrow) and myonecrosis (red arrow) (H and E, ×200)
