Table 1.

Main morphological changes observed in the placentas from the 15 COVID-19 positive woman.

CASE	PLACENTAL WEIGHT (g)and [percentile] (*)	HISTOPATOLOGY [19,40]
1	448 [25–50]	Histiocytic-neutrophilic intervillositis Avascular and fibrotic villi and stroma-vascular karyorrhexis Accelerated villous maturation Chorangiosis
2	472 [25–50]	Borderline massive perivillous fibrin deposition
3	440 [25–50]	Maternal vessels thrombosis of capsularis decidua Focal acute chorioamnionitis
4	240 [5–10]	Infarct Intervillous hematoma
5	435 [25–50]	Normal
6	429 [75–90]	Maternal decidual vasculopathy
7	542 [55–75]	Chorionic plate infarct Borderline massive perivillous fibrin deposition
8	400 [10–25]	Small infarcts Acute deciduitis Focal distal villous immaturity
9	444 [25–50]	Transmural massive perivillous fibrin deposition Infarct and acute deciduitis Accelerated villous maturation
10	515 [50–75]	Chorionic vasculitis Intervillous hematomas Chorangiosis Infarct Peripheral funisitis
11	470 [25–50]	Transmural massive perivillous fibrin deposition Intervillous hematomas Chorangiosis
12	790 [ >90]	Accelerated villous maturation Subchorial hematoma
13	582 [75–90]	Accelerated villous maturation Intervillous hematomas Chorangiosis
14	440 [25]	Marginal infarct
15	477 [25–50]	Chronic villitis and histiocytic-lymphocytic intervillositis Maternal infarct Accelerated villous maturation

^⁎Percentiles and standard deviations for placental weights by gestational age.