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FIG 3. A and B, Lateral skull radiograph of a fetal specimen with a gestational age of 19 weeks 5 days (A) and T2-weighted fast spin-echo MR image (4500/90/4) of a fetal specimen with a gestational age of 19 weeks 3 days (B) show progressive ossification of the skull base from posterior to anterior. The ossification has extended to the postsphenoid (open arrow), which encloses the pituitary to form the sella turcica. The cerebral hemispheres have greatly expanded. Note ossification of presphenoid (curved arrow) on lateral radiograph (arrow, basiocciput; O, orbitosphenoid; ts, tuberculum sellae)
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