Diffusion Tensor MR Imaging Visualizes the Altered Hemispheric Fiber Connection in

were evaluated by diffusion tensor imaging and fiber trac-tography. In partial agenesis of corpus callosum, fiber tracts from all regions of brain converged to a partially developed small genu portion and connected to the con-tralateral side. In complete callosal agenesis, fibers from the hemispheres failed to cross the midline and formed thick bundles running anteroposteriorly (eg, Probst bun-dle). The thickness of the anterior commissure was en-larged or smaller than normal brain, and other white mat-ter tracts were not markedly different from normal brain tissue. Callosal dysgenesis, either complete or partial agenesis of corpus callosum (ACC), is a not an un-common congenital anomaly and various associated anomalies can occur. Aberrant fiber connections ar