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fig 10. CT scans show progressive ossification of the orbitosphenoid (arrow) at 16 weeks 2 days, 17 weeks 4 days, 18 weeks 4 days, and 24 weeks 4 days.
fig 11. CT scan of fetal specimen with a gestational age of 22 weeks 3 days shows ossification of alisphenoid (A), which forms the greater wing of the sphenoid. Foramen ovale and spinosum are seen as a large defect in the greater wing of the sphenoid (arrow)
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