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Boxplot demonstrating the minimum, first quartile, median, third quartile, and maximum of the observed over expected ratio in preoperative fetuses with open spinal dysraphism and postoperative fetuses with OSD at 1 week for the posterior fossa area, ventricular width, transverse diameter of the posterior fossa, transverse cerebellar diameter, cerebellar herniation level, and clivus-supraocciput angle.
