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Diagnostic ultrasound ( PDFDrive )

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CHAPTER 33 The Fetal Face and Neck 1141

A

B

C

D

FIG. 33.8 Sloped Forehead in Fetus With Posterior Encephalocele. (A) and (B) Two-dimensional and three-dimensional sonographic proiles

of a 28-week fetus with microcephaly and a small posterior encephalocele. The sloping forehead (arrow) is caused by a lack of forebrain development.

(C) Axial sonogram shows high occipital defect (calipers) through which a small amount of dysplastic brain protrudes. (D) Sagittal magnetic resonance

image shows microcephaly and the high occipital defect in the skull (arrow).

Conditions Associated With Hypertelorism

Chromosomal abnormalities

Trisomy 9p

45,XO

Single-gene disorders

Apert syndrome

Crouzon syndrome

Noonan syndrome

Developmental abnormalities

Craniosynostosis

Anterior encephalocele

Median facial cleft

Megalencephaly

Agenesis of the corpus callosum

Orbital teratoma

Cleft lip

Teratogens

Dilantin

Valproate

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