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. 2022 Nov 19;10(2):1426–1430. doi: 10.1002/ehf2.14228

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© 2022 The Authors. ESC Heart Failure published by John Wiley & Sons Ltd on behalf of European Society of Cardiology.

This is an open access article under the terms of the http://creativecommons.org/licenses/by-nc-nd/4.0/ License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made.

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Histopathological findings of endomyocardial biopsy samples. An endomyocardial biopsy showing mild inflammation on haematoxylin and eosin staining (A). Moderate endomyocardial thickening and mild interstitial fibrosis on Masson's trichrome staining (B). High‐power view of Masson's trichrome staining showing a microthrombus with fibrin and platelets within the arteriole (C, arrow). Immunohistochemical features of myocarditis: CD61 (C, inset), CD68 (D), CD3 (E), and tenascin‐C (F). CD61‐positive platelets were observed in obstructive microthrombi in the microvessels. CD68‐positive macrophages and a few CD3‐positive T‐cells infiltrated sparsely in the interstitium without necrosis of the adjacent cardiomyocytes. Tenascin‐C was distributed in the endocardium and partially located in the interstitium. Scale bars: 50 μm.