Fig 2. Patient 1. Fetal and neonatal brain MRIs.

Upper, Fetal MRI at 23 weeks gestation (single-shot, fast spin-echo).

Middle, Fetal MRI at 36 weeks gestation (single-shot, fast spin-echo).

Lower, Neonatal MRI (fast spin-echo T2).

A, Sagittal images.

B, Axial level of the thalami (upper) and parietal bones (lower).

C, Coronal level with the posterior lateral ventricles (upper) and parietal bones (lower).

Note: White arrows, parietal foramina with calvarial defects initially filled by CSF and then brain; black arrows, course of the abnormal interhemispheric venous drainage. Note the absence of the normally positioned straight sinus.)