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Serial scans of the fetal brain at 16 postmenstrual weeks. (A) An extreme anterior frontal–1 section (see Table 2–2) almost tangential to the fetal skull, showing the wide opening of the anterior fontanelle) (open arrow). (B) Frontal–2 section. The cortex and the white matter around the anterior horns are becoming progressively thicker. The sonolucency of the anterior horn (AH) is outstanding. The subarachnoid space is marked by the white arrow. (C) Midcoronal section. The choroid plexus (CP) and its connection through the interventricular foramina (small white arrows) are shown. The midline arrow indicates the falx. (D) Midcoronal–3 section through the antrum of the lateral ventricles, which are filled entirely by the choroid plexus (CP). The arrow indicates the falx. (E) Occipital–1 section. The posterior horns are marked by the small white arrows. The tentorium (t) is also indicated. (F) Horizontal Source: NORMAL TWO- AND THREE-DIMENSIONAL NEUROSONOGRAPHY OF THE PRENATAL BRAIN, Ultrasonography of the Prenatal section. The sonolucent cisterna magna is highlighted by the large white arrow. The cerebellum (C) and the fourth ventricle (small white arrow) are shown. Brain, 3e The anterior horns (F) and the inferior horns (T) are visible using this section. (G) An oblique section highlighting the choroid plexus (C) and one of the Citation: Timor-Tritsch IE,oblique–1 Monteagudo A, Pilu Malinger Ultrasonography the (O), Prenatal Brain, 3e; 2017(C) Available cerebellar hemispheres (C) (H) Right section withG,the anteriorG.horn (F), posterior of horn and choroid plexus situatedat:above the thalamus http://mhmedical.com/ Accessed: May 11, 2017 (T). The thick mass of the brain tissue is indicated by the two small arrows. Copyright © 2017 McGraw-Hill Education. All rights reserved