Placentomegaly

Last revised by Dr Jeremy Jones on 20 Sep 2021

Placentomegaly is a term applied to an abnormally-enlarged placenta.

It can be associated with a number of maternal and fetal disorders which include:

May show an increase in placental thickness and/or placental extent. The increase in size may be homo or heterogeneous dependent on the cause. The maximum thickness considered normal at any stage in pregnancy is often taken at 4 cm.

The differential for an apparent increased in placental size on ultrasound includes:

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