Table 1.

Placental pathology in COVID-19 positive mothers.

	Study	N	GA	COVID-19	Histological findings
					FVM	Other findings
1	Mulvey et al. [7]	5	38w–40w	0	Thrombosis, Intrauterine fibrin deposition, Villous stromal-vascular karyorrhexis	Focal increase in perivillous fibrin chorangiosis, Meconium
2	Bargen et al. [8]	20	33w–40w	0	Thrombosis, Intrauterine fibrin deposition, Villous stromal-vascular karyorrhexis,	Focal increase in fibrin, Intervillous thrombus, Focal chorangiosis Meconium, Maternal vascular malperfusion
3	Shanes et al. [9]	16	33w–40w	0	Fetal vessel-mural fibrin, Clustered avascular villi, Delayed villous maturation, Chorangiosis	Maternal vascular malperfusion
			16w(IUFD)			Villous edema, Retroplacental hematoma

N, total number of placentas; GA, weeks of gestation; COVID-19, number of COVID-19-positive neonates; FVM, fetal vascular malperfusion.