MRI is more informative, as not only does it demonstrate enhancement of the left frontal horn mass, but also demonstrates subcortical high T2 which matter regions scattered throughout the hemispheres (T2 series demonstrates frontal mass and subependymal nodules are seen as well as subcortical white matter hyperintensities). Sequences have not been optimized for imaging of the cortex, however, in places, there is the impression of thickened cortex (best seen on axial T1). The frontal horn mass presumably represents a subependymal giant cell astrocytoma.