Adult‐onset neuronal intranuclear hyaline inclusion disease is not rare in older adults
- 28 March 2016
- journal article
- review article
- Published by Wiley in Geriatrics & Gerontology International
- Vol. 16 (S1), 51-56
- https://doi.org/10.1111/ggi.12725
Abstract
Neuronal intranuclear hyaline inclusion disease (NIHID) is a rare neurodegenerative disorder pathologically characterized by localized neuronal loss, and the presence of eosinophilic intranuclear inclusions in neurons and glial cells. NIHID is a heterogeneous disease entity. It is divided into three clinical subgroups: infantile, juvenile and adult forms. Recently, reports of adult-onset cases have increased. Typical adult-onset NIHID consists of cognitive dysfunction with leukoencephalopathy. This type of adult-onset NIHID can be predicted by characteristic magnetic resonance images, high intensity areas on T2-weighted/fluid-attenuated inversion recovery images and persistent high intensity at the corticomedullary junction in diffusion-weighted images. When clinically suspected, the ante-mortem diagnosis can be made by biopsy. In adult-onset NIHID, nuclear inclusions are found more frequently in glial cells, and moderate to severe white matter degeneration is often associated. Although the underlying pathological mechanisms of NIHID are largely unknown, abnormal intranuclear accumulations of proteins and/or dysfunction of protein degradation systems might be related to the pathogenesis. To further clarify the characteristics of this disease entity, biological and pathological analysis of the patients is indispensable. As this disease entity becomes better known, diagnosed cases are expected to increase. Adult-onset NIHID might not be as extremely rare as previously thought.Keywords
Funding Information
- Establishment of High Quality Brain Bank
- National Center of Geriatric and Gerontology and Establishment of Japanese Brain Bank Network for Neuroscience Research
- Grants-in-Aid for Scientific Research on Innovative Areas (221S0003)
- Ministry of Education, Sports, Science and Technology, Japan
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