Centro de Ecografia Dr. Vicente J Ruiz, Salta, Argentina

This is a case of a 16-year-old-primigravida at 17 weeks of gestation with an acrania due to amniotic band.

Transabdominal axial and coronal views of  fetal head showing absence of skull bones and exencephaly:

Transvaginal coronal views of fetal head showing absence of skull bones and exencephaly

Transvaginal sagittal view of brain tissue free in the amniotic fluid

Transvaginal views that show amniotic band attached to the fetal head

These are the postnatal images showing the amniotic band attached to the skull and the exencephaly