unable to identify normal brain tissue cephalad to the bony orbits or brainstem along with symmetric absence of the bony calvarium.
Anencephaly. Long-axis image of a 14-week fetus demonstrates a poorly developed, small head (arrows) visualized in continuity with the fetal spine (arrowhead).
NOTE THAT: It is First congenital anomaly to identify in utero with ultrasound. The diagnosis can be made as early as the 12th week of gestation and is typically made at the time of an attempted biparietal diameter determination for fetal age.