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Ultrasound

How many sacs are seen? What type of multifetal pregnancy is seen in the case?

Two gestation sacs are well seen, with three yolk sacs, confirming a triplet gestation.

What is Ipsilon zone?

Ipsilon zone is formed by three amniotic membranes of a triamniotic triplet pregnancy. It may help determining the chorionicity of triplet pregnancy, and is equivalent of 'twin peak' sign.

Fetus A and Fetus B share the same gestational sac, with no intervening membrane visualised. However two separate yolk sacs are present, and this is highly suggestive of a monochorionic diamniotic gestation.

Fetus C is in a separate gestational sac, and is hence the dichorionic diamniotic sibling of Fetuses A and B.

Gestational age 6 weeks and 1 day.

Ultrasound

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Case courtesy of Alexandra Stanislavsky ◉ rID: 12545

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