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Diagnostic ultrasound ( PDFDrive )

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CHAPTER 34 The Fetal Brain 1181

A

B

C

D

cb

E

F

FIG. 34.13 Encephalocele. (A) Occipital encephalocele on axial view at 22 menstrual weeks shows brain tissue (arrow) herniating through

the occipital bony skull defect. (B) In another fetus, a small skull defect is seen with only meninges and no brain tissue in this fetus with ventriculomegaly

and meningocele. (C) Asymmetrical parietal encephalocele (arrow). Coronal view at 21 menstrual weeks shows asymmetrical

encephalocele. (D) Anterior encephalocele (arrow) at 18 weeks containing brain herniated through a defect between the orbits where it appears

as a mass in the expected area of the nose. Also, slight hypertelorism is present. e, Eyes; h, hand. (E) Atretic encephalocele seen as a small

subtle blister (curved arrow) in the scalp on midsagittal color Doppler image. Typically, these do not contain brain tissue but are associated with

an abnormal falcine venous sinus of Markowski (arrow), which courses from the cerebral vein to the superior sagittal sinus. The vein of Galen can

be absent. cb, Cerebellum. (F) Small encephalocele (arrow) associated with severe ventriculomegaly on magnetic resonance image.

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