Figure 8. Agenesis of the corpus callosum in a fetus at 34 weeks gestation. Coronal RARE MR image (single shot/60) shows the characteristic vertical orientation of the frontal horns (arrows) in agenesis of the corpus callosum. Arrowheads point to the region where the corpus callosum should be depicted. The US scan demonstrated only asymmetric mild ventriculomegaly. (Reprinted, with permission, from reference 55.)