Figure 13a. Frontal encephalocele and interhemispheric lipoma in a neonate. (a) Lateral skull radiograph shows a triangular area of lucency (arrowhead), which represents a lipoma of the corpus callosum. (b) Axial CT scan shows the lipoma as a triangular area of low attenuation (arrowhead). An anterior skull defect and soft-tissue mass (arrow in a) are most easily appreciated on the CT scan (b).