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A and B, Lateral radiograph (A) and CT scan (B) of fetal specimen with a gestational age of 16 weeks 2 days show early ossification of the four primary centers of the occipital bone that surrounds the foramen magnum: supraoccipital (solid arrow), basioccipital (open arrows), and exoccipital (curved arrows). Note ossification of the frontal bone, vomer (v), pterygoid plates, zygoma, mandible, and maxilla
