Figure 1.

(a–c). T1-weighted midsagittal magnetic resonance (MR) images of the brain demonstrating agenesis of the corpus callosum in the first ((a) – contrast enhanced), second ((b) – postoperative) and third ((c) – showing also a tumor in the cervical cord) patient. (d) Axial T2-weighted MR image through the brain of patient 1 illustrating the periventricular gray matter heterotopias. (e) Axial contrast-enhanced T1-weighted MR image through the brain of patient 2 (postoperative) illustrating the large gray matter heterotopia (arrow) in the right occipital region. (f) Sagittal contrast-enhanced T1-weighted MR image through the cervical spine of patient 3, illustrating the intramedullary anaplastic asctrocytoma.