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Pathological findings in endomyocardial biopsy (EMB) at first episode. (A) EMB specimen showing extensive myocardial inflammation associated with diffuse myocytes necrosis [hematoxylin and eosin (H&E); scale bar 200 μm]. (B) Strong positivity of immunohistochemistry for T‐lymphocytes (immunostaining anti‐CD3; scale bar 200 μm).
