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Triplets can be either fraternal, identical, or a combination of both. The most common are strictly fraternal triplets, which come from a polyzygotic pregnancy of three eggs. Less common are triplets from a dizygotic pregnancy, where one zygote divides into two identical fetuses, and the other doesn’t. Least common are identical triplets; three fetuses from one egg. In this case the original zygote divides into two, and then one of those two zygotes divides again but the other does not.
Ultrasound is ideal for determining chorionicityin the first trimester.
The twin peak sign (also known as the lambda (λ) sign) is a triangular appearance of the chorion insinuating between the layers of the intertwin membrane and strongly suggests a dichorionic twin pregnancy. It is best seen in the first trimester (between 10-14 weeks). While the presence of a twin peak sign is a useful indicator of dichorionicity, its absence, however, is not that useful in confidently excluding it.
The “T sign” is really the absence of a twin-peak sign (or lambda (λ) sign) and is used in ultrasound assessment of a multifetal pregnancy.It refers to the lack of chorion extending between the layers of the intertwin membrane, denoting a monochorionic pregnancy. The intertwin membrane comes to an abrupt halt at the edge in a T configuration.
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