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Diagnostic ultrasound ( PDFDrive )

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CHAPTER 33 The Fetal Face and Neck 1137

Ant

Occ

A

B

A

P

C

D

E

FIG. 33.4 Variety of Abnormal Head Shapes. (A) Lemon-shaped skull in association with neural tube defect. Axial sonogram shows concave

deformity of the frontal bone as well as ventriculomegaly at 23 weeks’ gestation. (B) Brachycephaly and strawberry shape (pointing anteriorly,

lat occiput) at 20 weeks in a fetus with trisomy 18. Cephalic index is 96% (normal, 80%). Ant, Forehead; Occ, occiput. (C) Craniosynostosis

with cloverleaf skull. Note the trilobite shape seen with craniosynostosis of the coronal (arrowheads) and other sutures except the squamosal in

this fetus with thanatophoric dysplasia. A, Anterior; P, posterior. (D) Metopic craniosynostosis. Axial sonogram of a 27-week fetus with a

pointed anterior skull secondary to metopic synostosis. (E) Frontal bossing (arrowhead) in a fetus with hypochondroplasia. Also note a “saddle

nose,” with the nasal bone meeting the frontal bone at an abnormal 90 degrees. A small thorax and a protuberant abdomen are present. (B and

C courtesy of Ants Toi, MD.)

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