Multiple and bilateral supratentorial areas of T2 and FLAIR high signal involving the subcortical white matter mainly at parietal, frontal and posterior temporal regions with nodular enhancement on postcontrast sequences. The lesions are almost imperceptible on T1 and DWI. No haemorrhagic component seen on the GE sequence.
Both cerebellar hemispheres, brainstem, basal ganglia and thalami are spared.