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. 2022 May 10;12(1):22. doi: 10.1186/s41935-022-00280-8

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Fig. 3 — Microscopic lung findings. A Exudative diffuse alveolar damage (DAD) showing discrete hyaline membranes and prominent capillary congestion [haematoxylin and eosin (H&E)]. Insert: immunohistochemistry (IHC) for fibrinogen showing the extent of hyaline membranes. B Syncytial cells of pneumocyte II origin (H&E). Insert: IHC for thyroid transcription factor 1. C Extensive capillary congestion without DAD (H&E). D Microthrombi in alveolar capillaries (IHC for fibrin). Note: Source of figure from Menter et al. (2020)