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Diagnostic ultrasound ( PDFDrive )

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FIG. 34.24 Type 2 Lissencephaly (Cobblestone Cortex, Walker-Warburg Phenotype) at 21 Weeks. (A) Coronal view shows the large,

smooth ventricles and the very small brainstem (arrow). (B) Defect in vermis (vermian hypoplasia; arrow). (C) Midsagittal view shows the Z-shaped

kink in the brainstem (arrow), which represents failure of the brainstem to straighten and lose the early embryologic lexures, a process that normally

occurs after 12 to 13 weeks. Also, the cerebellar vermis is very small (arrowhead). The third ventricle is malformed. The corpus callosum (cc) is

malformed and extremely elevated. There is a minute occipital encephalocele (open arrowhead). This fetus also had eye abnormalities. (D) In a

different fetus at 36 weeks, transvaginal scan shows smooth cortex (agyria), abnormal for this gestational age. (E) Coronal T2-weighted magnetic

resonance image shows the smooth cortex and abnormal bands of high signal intensity in the parenchyma. Note the prominent extraaxial CSF

spaces. (F) Another fetus with severe VM and lissencephaly caused by Walker-Warburg syndrome. Note that this is the same fetus shown in Fig.

34.13B with a small cephalocele.

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