Fig. 3
From: Autopsy findings in COVID-19 infection-related death: a systematic review
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)