This video shows Fetal Anencephaly with a short view by the 4D probe.
Anencephaly is also known as an "open skull," is a birth defect in which the major parts of the brain, scalp, and skull of the fetus do not form completely as it is developing in the womb. Infants with anencephaly are stillborn in about 75 percent of cases. But newborns who survive die within several hours, days, or weeks.
Theoretically, Anencephaly can be diagnosed as early as 8 weeks; however, it may be missed in the first trimester. There is 100% accuracy in the second trimester for this diagnosis by ultrasound.
Anencephaly is when the neural tube fails to close at the base of the skull. Neural tube defects may be caused by genes passed on from both parents and by environmental factors. Some of these factors are obesity, uncontrolled diabetes in the mother, and intake of some medicines during pregnancy.
Anencephaly is the most severe form of cranial neural tube defect (NTD) and is characterized by an absence of cortical tissue (although the brainstem and cerebellum may be variably present) as well as an absence of the cranial vault. The morphological spectrum within anencephaly ranges from holocrania (most severe form) to merocrania (mildest form).
As with many other malformations, a number of associated abnormalities are recognized:

other neural tube defects: spina bifida (especially cervical)

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