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DAD. (A) Lung parenchyma with haemorrhage, alveolar oedema and abundant hyaline membranes (H&E 100×). (B) Vascular thrombosis (H&E 200×). (C) Mono- and multinucleated cells with nuclear inclusions suggestive of viral cytopathic changes. (D) Immunohistochemistry: expression of CD68 in intraalveolar macrophages (400×) and of TTF1 in pneumocytes.
