![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEikLsjn5mgaQcYYJs9hg-o2O-rNDCpLx7sT4ZPXaL-Y33PL4BdMZu64psAtkfYgcHblny0qt_AYB5c8uUhzMkg8DxJYX5HqOTxMHA6GM6xRPxrKlspWrgxerxJ8rzraTxl1bWLmKrQuaSTz/s400/DichorionicDiamniotic.jpg)
This sign is helpful when there is a single placenta, a dividing membrane and twins of the same gender. The diagnostic dilemma in this case is between a monozygotic gestation (monochorionic-diamniotic) and a dizygotic gestation with fused placentas (dichorionic-diamniotic) whose twins just happen to be the same gender. The twin peak sign will clinch the diagnosis for a dichorionic-diamniotic twin gestation.
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