PLACENTAL APPEARANCE IN CHROMOSOMAL ANOMALIES
Triploidy
Partial mole.
Small placenta. Single umbilical artery. Dysmature and hypovascular villi.
Trisomy 18
Syncytial knots. Villous cellularity. Cisternae in villi. High resistance to flow.
Trisomy 21
Villous dysmaturity. Hypovascularity.