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Diagnostic ultrasound ( PDFDrive )

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1184 PART IV Obstetric and Fetal Sonography

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FIG. 34.14 Cranial Findings of Chiari II Malformation With Open Spina Biida. (A) “Lemon sign” with indentation of frontal bones. (B)

“Banana sign” of compressed cerebellum (arrows). The cerebellum is tightly compressed against the occipital bone and curves around the

brainstem, and there is no luid in the cisterna magna (effacement of cisterna magna). (C) Axial ultrasound shows the pointed appearance of the

posterior tips of the ventricles (arrows). (D) Sagittal T2-weighted magnetic resonance image shows inferior displacement of the cerebellum typical

of the Chiari II malformation (arrowhead) and inferiorly, the spinal defect (arrow). (E) Axial magnetic resonance image shows the pointed appearance

of the ventricles. (F) Coronal magnetic resonance image shows ventriculomegaly and obliteration of the cisterna magna. (G) Normal intracranial

translucency (IT) at 12 weeks. Note three dark bands and four white lines. Intracranial translucency is really the forming fourth ventricle. BS,

Brainstem; CM, cisterna magna. (H) Abnormal IT with spina biida. The brainstem (thick arrow) is thickened. The IT and CM are absent (do not

contain luid) (small arrow). (Courtesy of Dr. K. Fong, Mt. Sinai Hospital, Toronto, Ontario.)

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