Figure 1b:

Focal polymicrogyria detected with fetal MR imaging at 23 gestational weeks. (a) Fetal axial single-shot fast SE T2-weighted image demonstrates a large area of encephalomalacia involving the left frontal and parietal lobes (arrow). (b) Fetal coronal single-shot fast SE T2-weighted image demonstrates abnormal cortical infoldings in the left frontal lobe in the area of encephalomalacia, consistent with polymicrogyria (arrow). (Reprinted, with permission, from reference 21.) (c) Postnatal axial T2-weighted image demonstrates volume loss and polymicrogyria involving the left frontal and parietal lobes (arrow).