Fig. 1

Neural tube defect following termination of pregnancy in a foetus at 25 weeks gestation. A small neural tube defect is identified on external examination at autopsy with the foetus viewed from the left side (a) and from behind (b). On the corresponding post-mortem ultrasound performed 4 days after death, the sagittal view of the cranio-cervical junction (c) demonstrates herniation of the cerebellar tonsils (solid white arrows) into the upper cervical spinal canal. The sagittal ultrasound image of the lumbosacral spine (d) demonstrates the small neural tube defect (dashed arrows)