Twin-peak sign

Case contributed by Bruno Di Muzio
Diagnosis certain


22 weeks twin pregnancy. Routine antenatal ultrasound.

Patient Data

Age: 25 years
Gender: Female

Antenatal US (selected images)


Transverse image of the placenta reveals a triangular peak of villi extending from the placenta into the intertwin membrane. 

Case Discussion

The twin peak sign indicates the presence of a dichorionic-diamniotic twin gestation. It represents the extension of placental villi into the potential space that is formed from the reflection of opposed amniotic and chorionic layers from each fetus.

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