Fig 5. Coronal T2 sequence from (A) 18-week, (B) 22-week, and (C) 40-week fetuses. The disk space appears as a linear low-signal-intensity area in the 18-week fetus (small arrow). High signal intensity is seen in the disk space of the 22-week and 40-week fetuses (large arrow). The disk height and vertebral body increase in size with increasing gestational age. The proportion of the vertebral body that is ossified increases with increasing gestational age.