Fig. 7.

Fetal and postnatal corpus callosum and corticospinal tract segmentation in a boy (case 9) with a midline parieto-occipital cyst. a–c Age 29+4 gestational weeks. a Coronal diffusion tensor imaging (DTI) of segmented right (yellow) and left (green) corticospinal tracts superimposed with the corpus callosum (blue) in the fetal brain. b Overlay of the segmented fiber tracts on an axial T2-weighted image. c Sagittal view of the left corticospinal tract (green) reveals a tract that appears intact. Partially viewed is the corpus callosum (blue) as well on this T2-weighted image of the fetal brain. d–f Age 5 days. d Coronal DTI image of segmented right (yellow) and left (green) corticospinal tracts superimposed with the corpus callosum (blue) in the postnatal brain. e Axial view of the segmented tracts on a T2-weighted image shows lateral displacement of the fiber tracts posteriorly from the midline cyst. f Overlay of the segmented left corticospinal (green) and corpus callosum (blue) tracts on a sagittal T2-weighted image of the postnatal brain