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Microscopic lung findings in Covid-19. (A) Loose intra-alveolar fibrin exudates (arrow), admixed with inflammatory cells (star). Masson's trichrome. (B) Intra-alveolar “fibrin balls” (arrow). Hematoxylin-eosin staining. (C) Intra-alveolar loose fibrous plugs (star) of organizing pneumonia. Masson's trichrome. (D) Endotheliitis (arrow) in a small arterial vessel. Hematoxylin–eosin staining. The scale bar corresponds to 50 μm for A, B and C, and 100 μm for D.
