Preschooler with seizures

CT and MRI of oligodendroglioma
Axial CT without contrast of the brain (above left) shows a right parietal ill-defined subcortical hypodensity. Axial (above right) and coronal (below right) T2 MRI of the brain show right parietal subcortical hyperdensities with associated cortical thickening that on axial T1 MRI with contrast (below left) shows minimal enhancement.

The diagnosis was oligodendroglioma.