FIGURE.

A and B, A 25-week-old fetus with a lumbosacral MMC (arrow) and Chiari II malformation (arrow) with the cerebellum extending to approximately the C3 level. The patient underwent postnatal repair with follow-up MR imaging (C) at 8 years demonstrating persistent brainstem and cerebellar herniation to C2 (white arrow). D, A 21-week 6-day-old fetus with a lower lumbar MMC (arrow) and Chiari II malformation with the cerebellum extending to approximately the C3 level (arrow). E, Status post fetal repair at 22 weeks 5 days with no residual cerebellar or brainstem herniation at 9 years of age (white arrow).