Figure 1. Photomicrograph of the lung. A – thrombosis of the vasa interna (black arrow) of a pulmonary vein in COVID-19 (H&E 10x20); B – thrombosis of the vasa interna (black arrow) of a pulmonary artery with thrombosis of the pulmonary artery, in COVID-19(H&E 10x20); C – thrombosis of the vasa externa (black arrow) and fibrin thrombus within the lumen in COVID-19&E 10x20); D – thrombosis of a medium size pulmonary artery with thrombosis of its vasa interna (black arrow) and new thrombus formation within the lumen (blue arrow) in COVID-19 (H&E 10x20).