A number of findings in the placenta may indicate maternal vascular malperfusion.

Criteria for maternal vascular malperfusion - at least 2 of the following:

(1) placental weight < 10th percentile for gestational age

(2) number of marginal infarcts > 2

(3) number of central infarcts >= 1

(4) evidence of abruption

(5) decidual arteriopathy

(6) thin umbilical cord


Criteria for severe malperfusion:

(1) placental weight < 10th percentile

(2) multiple non-marginal infarcts

(3) > 30% of the placental parenchyma showing pathologic change

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