Figure 3b. Partial ACC in a 9-year-old boy with seizure disorder. (a) Axial inversion-recovery image shows partial ACC with a remaining genu portion (*) and colpocephalic configuration of the lateral ventricles (arrows). (b) FT image shows anteroposteriorly running Probst bundles (green fibers) (arrowheads). These converge into the small remaining genu portion (arrow), which connects fibers from not only the frontal lobe but also from other regions of the brain. Compare this appearance with the normal configuration of the corpus callosum and the midline crossing fibers shown in Figure 1b.