A known case of neurofibromatosis type I showing bilateral and almost symmetrical focal areas of high T2 and FLAIR signal intensities in the basal ganglia (namely the globus pallidus and thalamus), brainstem (midbrain and to much lesser extent pons), and subcortical white matter (temporal and parietal regions) representing focal areas of signal intensity (FASI).

Bilateral diffuse optic nerve enlargement and elongation with fusiform exophytic mass formation representing bilateral optic nerve gliomas.