Fig. 3

Microscopic view of the heart. a, b A low-power view of the apex of the left ventricle showed degeneration of the myocardium intermingled with interstitial fibrosis and hemorrhage. Bar = 500 μm (H&E staining; original magnification: × 40) (a). Bar = 500 μm (Masson trichrome staining; original magnification: × 40) (b). c A high-power view of the myocardium revealed remarkable degeneration and necrosis presenting wavy change and thinning. Bar = 100 μm (H&E staining; original magnification: × 200). d Contraction band necrosis was seen on the posterior to inferior wall. Bar = 50.0 μm (H&E staining; original magnification: × 400)