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Sagittal T2 SSFSE from fetal MR imaging at 23 weeks' and 3 days' gestational age (A) with severe or grade 3 Chiari II malformation (arrow). Sagittal T2 FSE image from postnatal MR imaging in the same patient at 2 weeks of age after in utero repair of OSD (B) demonstrates resolved cerebellar ectopia (arrow).
