Placentomegaly is a term applied to an abnormally enlarged placenta.
It can be associated with a number of maternal and fetal disorders which include:
- maternal anemia(s)
- maternal diabetes
- chronic intrauterine infections
- umbilical vein obstruction
- fetal high output failure
- fetal malformation
- in utero infection
- Finnish type congenital nephrotic syndrome
- fetomaternal hemorrhage
- placental abnormalities
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: