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Pathological findings. Haematoxylin–eosin and picrosirius red‐stained samples showed mild extracellular expansion and minimal lymphocytic infiltrates with mild infiltrative interstitial fibrosis. Anti‐transthyretin immunohistochemistry was positive for transthyretin. There was only a minimal increase in CD3+ T‐lymphocytes, with a predominance of CD4+ T‐lymphocytes, and myocardial CD68+ macrophages, which did not fulfil the pathological diagnostic criteria of myocarditis.
