[Neuronal Intranuclear Inclusion Disease(NIID)].

Neuronal intranuclear inclusion disease(NIID)is a progressive neurodegenerative condition characterized by eosinophilic hyaline intranuclear inclusions in neuronal and other somatic cells. Since 2011, when skin biopsy was proven to be a diagnostic tool, the incidence of NIID has been increasing. Its symptoms include dementia, muscle weakness, and sensory or autonomic disturbance. MRI shows hyperintense lesions of the subcortical white matter, especially on the U-fiber. These findings persist and continue to worsen for years.