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Histopathological analysis of the resected myocardium. (A) Histopathologically, interstitial fibrosis (yellow arrow) and myocardial degeneration such as irregular arrangement (white arrow) or vacuolar changes (blue arrow) are seen. Masson trichrome stain ×200. (B) Myofibrillary loss (red arrow), dilatation of sarcoplasmic reticulum (asterisks), and proliferation of small sized mitochondria (yellow arrows) are recognized by electron microscopy ×500.
