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. 2023 Mar 10;482(4):653–669. doi: 10.1007/s00428-023-03523-8

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© The Author(s) 2023, corrected publication 2023

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Fig. 2 — Hypertrophic cardiomyopathy (HCM) and pitfall (postmortem hypercontraction). A Macroscopic short axis cut with circumferential hypertrophy of the left ventricle. There is also prominent septal hypertrophy with anteroseptal irregular scarring. Note also prominent papillary muscles and trabeculae in the left ventricle. B Microscopic section shows individual myocyte and bundle disarray with hyperchromatic nuclei. There is an increase in interstitial collagen, findings in keeping with HCM (hematoxylin and eosin stain). C Macroscopic short axis cut with circumferential increase in thickening of the left ventricle due to hypercontraction. There is no scarring or prominent septal hypertrophy. Note also the prominent papillary muscles and trabeculae in left ventricle. D Microscopic section shows myocyte hypercontraction with contraction bands in otherwise normal myocytes. There is no increase in interstitial collagen (hematoxylin and eosin stain)