Fig. 4. Illustration of various examples resulting from ossification disruption. (A) The normal layout of the somites relative to the neural tube and T/L junction. (B) A unilateral (possibly bilateral) cranial shift resulting in a defect in the caudal regions. (C) A bilateral (possibly unilateral) caudal shift which results in malformations in the cranial regions. (D) Overlapping developing somites resulting in transitional vertebrae (possible with both cranial and caudal border shifts). T/L, thoracolumbar; X, defect.
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