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Diffuse alveolar damage (DAD) pattern of lung acute injury in COVID19. (a) Exudative phase showing hyaline membranes. Multinucleated pneumocyte with cytopathic-like changes. (b) Organizing-fibrotic phase of DAD, note the presence of calcification. (c) Desquamative pneumocytes highlighted with pankeratin stain. (d) Organized thrombus. Inset: CD61 expression in a septal capillary thrombus.
