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. 2021 Sep 18;8(6):4710–4714. doi: 10.1002/ehf2.13613

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© 2021 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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Histology and immunohistology of endomyocardial biopsy. (A) Haematoxylin and eosin stain, primary magnification 40:1. Infiltration of mononuclear inflammatory cells (macrophages and lymphocytes) with mild interstitial oedema. Non‐hypertrophic myofibres with regular nuclei and cytoplasm without degeneration or necrosis. (B) Immunohistochemistry, CD68, anti‐alkaline phosphatase method, primary magnification 20:1. Considerably increased number of macrophages. (C) Immunohistochemistry, CD3, anti‐alkaline phosphatase method, primary magnification 20:1. Moderately increased number of T lymphocytes.