Fig. 1
From: COVID-19 in pregnancy: placental pathological patterns and effect on perinatal outcome in five cases
Histological section of a recent thrombus showing alternating layers of red blood cells and fibrin (a Case 5, Haematoxylin and eosin stain× 40, arrowheads: layers of fibrin). Note the absence of chorionic villi, which are displaced to the periphery. An old thrombus with uniform granular eosinophilic appearance (b haematoxylin and eosin stain × 40). Avascular villi with eosinophilic pauci-cellular stroma (c Case 5, haematoxylin and eosin stain × 100, Arrows: Avascular villi)