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An endomyocardial biopsy from the right ventricular septum did not show obvious myocardial necrosis or interstitial fibrosis. Macrophage infiltration was observed, but infiltration of lymphocytes, eosinophils, and neutrophils was only slight (A). Electron microscopy revealed myofibril disarrangement and the proliferation of mitochondria in the myocytes but no abnormalities in vacuoles consistent with secondary cardiomyopathy (B).
