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Anencephaly
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ultrasound a a  
  Transabdominal ultrasound of 20-week fetus with anencephaly. Note absent cranium (arrow). Transabdominal ultrasound of anencephalic head of 20-week fetus.  
mri a a a
  Diamniotic monochorionic twins at 20-weeks gestational age. Non-presenting twin has anencephaly (arrow). There is no ossified cranium present above the orbits. Note the twin membrane (red arrow). Note twins, one with anencephaly. Note prominent orbits characteristic of anencephaly.