A. 3D ultrasound volume with CrystalVue™ and RealisticVue™ applied of a fetus with Trisomy 21 at 14+3 weeks gestation, born with intact amniotic sac. The light source is placed behind the fetus enabling visualisation of the amniotic sac and insertions of the umbilical cord both into the placenta and anterior abdominal wall.
B. Schematic illustration of the fetus and the fetal membranes. Structures with an asterisk [*] are not visible in the 3D ultrasound volume, but have been added to illustrate the relation between the developing fetus, fetal membranes, and placenta.
C. Annotated 3D ultrasound volume.