First Trimester Scans Abnormal Findings

First Trimester Scans

Abnormal Findings

?

?

?

?

?

Multiple gestations

Ectopic pregnancy

Pregnancy of unknown location

Gestational trophoblastic disease (Molar pregnancy)

Subchorionic hematoma

¡®There is NO diagnosis of

twins. There are only

monochorionic twins or

dichorionic twins.¡±

Kypros Nicolaides

Dichorionic, Diamniotic Twins

Chorionicity in the First Trimester

? Two yolk sacs are present in up to a third of all MCMA twin

pregnancies, dispelling the original concept that a single yolk

sac is diagnostic of MCMA pregnancies.

? Yolk sac number should not be used to determine amnionicity.

The Significance of Yolk Sac Number in Monoamniotic Twins. Fenton, Reidy, demyanencko,Palma-Dias, Cole, Umstad. Fetal Diagn Ther. 2019 Feb 14:1-7.

? The lambda sign predicts chorionicity

with a high degree of accuracy before

14 weeks of gestation.

First-trimester ultrasound determination of chorionicity in twin gestations using the

lambda sign: a systematic review and meta-analysis. Maruotti, Saccone, Morlando,

Martinelli. Eur J Obstet Gynecol Reprod Biol. 2016 Jul;202:66-70

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