Neuronal intranuclear inclusion disease (NIID) is a progressive neurodegenerative disease that is characterized by eosinophilic hyaline intranuclear inclusions in neuronal and somatic cells. The wide range of clinical manifestations in NIID makes ante-mortem diagnosis difficult1,2,3,4,5,6,7,8, but skin biopsy enables its ante-mortem diagnosis9,10,11,12.