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(A) Antenatal MRI sagittal T2-weighted image in the midline shows absence of the corpus callosum in the expected position (arrow). A midline cyst is noted anteriorly (*). The cisterna magna is slightly prominent (x). (B) Antenatal MRI coronal T2-weighted image shows the interhemispheric fissure extending down to the roof of the third ventricle (arrow). Nodular heterotopia is noted on the right (*).
