Factors that place a woman at increased risk include:
Finding indicative of anencephaly:
Absence of the cranial vault and brain above the base of the skull and orbits. |
|
Failure to obtain an adequate view of the bi parietal diameter in the second trimester should raise suspicion. | |
Hydramnios from impaired fetal swallowing commonly accompanies anencephaly but is typically a late finding. (85% after 25 weeks but in only 10% before this time). | |