<unk>  can be diagnosed early in pregnancy through an ultrasound. This abnormality appears during the beginning or end of the fourth week of the fetus's development. An absence of the skull is needed in order to make a diagnosis. A presence of brain tissue will confirm the diagnosis of<unk>  and differentiate it from other developmental problems such as anencephaly.
Acrania
Macrodontia 
Macrotia
Microcoria
Spotted lunulae
Amastia
Macrostomia
Polycephaly