Embryological evaluation of surface features of human embryos and early fetuses by 3-D ultrasound.

OBJECTIVE

To visualize embryonal and early fetal surface features using transvaginal (3-D) ultrasound.

METHODS

Seventy patients at 5-11 weeks of gestation (10 at each week) were studied.

RESULTS

3-D ultrasound could visualize the surface morphology, showing its clinical applicability. From 5 to 6 weeks the embryo was observed in the shape of a 'C' in 70% of all embryos. At 7 weeks, the head could be distinguished from the trunk in a ll embryos. Until 9 weeks, the four extremities were observed in all fetuses and the formation of midgut herniation in 80%. From 10 to 11 weeks, the visualization rates of the ears, orbits and fingers were 40%, 30% and 40%, respectively.

CONCLUSION

3-D ultrasound is useful to recognize the surface morphology of embryos and early fetuses.