ultrasound diagnosis of fatal anomalies

MULTIPLE PREGNANCY
Fig. 15.1 Twins. Vaginal scan demonstrating the
“lambda sign” in diamniotic dichorionic twins at
12+ 1 weeks. There is a thick membrane (chorion)
separating the two amniotic cavities; thin layers of
amnion are also seen.
Fig. 15.2 Twins. Vaginal scan at 6+6weeksofgestation
in diamniotic monochorionic (and thus monozygotic)
twins.
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Fig. 15.3 Twins. Monochorionic diamniotic
(monozygotic) twins at 7+6weeks,demonstrating
the amnion and both yolk sacs.
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