Neurofibromatosis type 1 (cerebellar FASI)
3 year old girl admitted post first episode of seizure activity. Family history of neurofibromatosis.
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Areas of T2/FLAIR high signal areas in the cerebellum bilaterally, more evident on the left consistent with focal areas of myelin vacuolisation.
Focal areas of signal intensity (brain) (FASI) are the most common neuroimaging feature of neurofibromatosis type 1. FASI can be found in the basal ganglia, thalamus, brainstem (pons), cerebellum, and subcortical white matter. FASI represent spongiform myelinopathy or vacuolar change of myelin with no inflammatory reaction in the surrounding tissue.