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Figure 5a. Posterior encephalocele in a fetus at 20 weeks gestation. (a) Axial US scan shows a posterior encephalocele. A small amount of tissue (arrow) is seen within the sac. (b) On the axial RARE MR image (single shot/60), the structures of the posterior fossa appear to be normal. A portion of the encephalocele (arrowheads) is seen posteriorly. The information that the majority of the brain appeared to be normal was helpful to the patient in deciding to continue the pregnancy. Postnatally, a meningocele sac was excised, and the neural content returned to the posterior fossa. At the time this article was written, the baby was doing well at 1 year of age.