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. 2021 Oct 8;10(20):e020358. doi: 10.1161/JAHA.120.020358

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© 2021 The Authors. Published on behalf of the American Heart Association, Inc., by Wiley.

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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Endocardial (EF) and interstitial (F) fibrosis in the left ventricle endomyocardial biopsy from a transthyretin‐positive (A and C) and a lambda+ AL (B and D) CA showing a brilliant, strong blue color by Masson's trichrome staining; it is associated with subendocardial and interstitial amyloid (A) deposits that stain blue‐gray on the same Masson's trichrome staining. Myocytes (M) are encircled by fibrosis and by amyloid (Masson's trichrome staining; original magnification: A and B, ×40, C and D, ×100).