Neuronal intranuclear inclusion disease (NIID) is a neurodegenerative disorder with characteristic high signals along the corticomedullary junction on MR DWI. However, cerebellar findings have not been fully evaluated on MRI and we reviewed them in a series of ten NIID patients. MRI results showed cerebellar atrophy (10/10), high intensity signal on FLAIR images in medial part of the cerebellar hemisphere immediately beside the vermis (paravermal area) (7/10), and in the middle cerebellar peduncle (6/10). The paravermal abnormal signals could be a clue for diagnosis of NIID even in the past MR studies in which DWI was not examined.
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