Patient came for her second-trimester scan (16 weeks gestation).
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A "coronal" section through the fetal face shows frog-like bulging of eyes and absent frontal bones.
The transvaginal scan (TVS) demonstrates the fetus in sagittal view.
Anencephaly is a lethal congenital anomaly which can be detected on ultrasound as early as 11 weeks of gestation.
If some amount of neural tissue is present, the condition is termed exencephaly.
Folic acid supplements for women of reproductive age are helpful for the prevention of neural tube defects. No treatment option is available for anencephaly.