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. 2022 Feb 7;10(2):e05378. doi: 10.1002/ccr3.5378

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© 2022 The Authors. Clinical Case Reports published by John Wiley & Sons Ltd.

This is an open access article under the terms of the http://creativecommons.org/licenses/by-nc/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.

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Histopathological Findings. Endomyocardial biopsy of the right ventricular septum was performed. (A, B) Hematoxylin–eosin staining of heart tissue specimens obtained by endomyocardial biopsy shows myocarditis with inflammatory cells and cardiomyocyte damage (arrowheads). A few eosinophils are observed (arrows). (C, D) Immunostaining shows more infiltration of T lymphocytes of CD3‐positive cells than those of CD20‐positive cells. (E) Immunostaining for CD68 shows the infiltration of several macrophages