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Diagnostic ultrasound ( PDFDrive )

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Cingulate

PO

Calcarine

A

B

21 wk

C

D

25 wk

Insula

In

ST

E

F

ST

FIG. 34.4 Scan Planes (Dark Lines) Used to Assess Early-Appearing Sulci. Note that the scan planes are perpendicular to the direction of

the sulcus being evaluated. (A) Medial hemispheric surface at 26 weeks. Coronal scan plane is best for cingulate sulcus (yellow arrow) and

calcarine sulcus. Axial plane is best for parieto-occipital sulcus (PO). (B) Axial view at 21 weeks shows the diamond shape formed by the normal

parieto-occipital sulci (arrow). (C) Coronal view through the occipital lobes at 24 weeks shows the calcarine sulcus (arrow) on the medial surface

of the occipital lobe. Mild left-right asymmetry is normal. CB, Cerebellum; V, ventricles. (D) Coronal view through parietal brain shows the notch

of the cingulate sulcus (arrow) above the bodies of the lateral ventricles and cavum septi pellucidi (csp). This is an excellent view to conirm normal

cavum septi pellucidi. (E) Lateral view of brain surface at 26 weeks shows the scan plane used to evaluate the insula (In) and superior temporal

sulcus (ST) behind it. (F) Angular plateau of the insula on axial view, and behind it the subtle indentation of the superior temporal sulcus (arrow

with ST). (Anatomic images modiied from Dorovini-Zis K, Dolman C. Gestational development of the brain. Arch Pathol Lab Med. 1977;101:192-195.

Ultrasound images from Toi A, Chitayat D, Blaser S. Abnormalities of the foetal cerebral cortex. Prenat Diagn. 2009;29[4]:355-371. 188 )

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