ultrasound diagnosis of fatal anomalies

SECOND SCREENING
Fig. 1.24 Second screening, 18–21 weeks.
Color Doppler sonography of the outgoing vessels of
the heart in the systolic phase, depicting the pulmonary
trunk, the ductus arteriosus (Botallo’s duct),
and the fetal aorta.
Fig. 1.25 Second screening, 18–21 weeks.
Fetal circulation at 21 weeks, depicted using the
color Doppler energy mode. Visible here are the aortic
arch leaving the heart, the thoracic and abdominal
aorta, one of the two umbilical arteries and its
course through the abdomen, as well as the intraabdominal
umbilical vein.
Fig. 1.26 Second screening, 18–21 weeks.
The fetal aorta (aortic arch with its three vessels arising
from the cranial part, thoracic and abdominal
aorta)as seen at 21 weeks, with the fetus lying dorsoposteriorly.
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