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Published in: Acta Neuropathologica 1/2015

01-07-2015 | Original Paper

Atypical multiple system atrophy is a new subtype of frontotemporal lobar degeneration: frontotemporal lobar degeneration associated with α-synuclein

Authors: Naoya Aoki, Philip J. Boyer, Cheryl Lund, Wen-Lang Lin, Shunsuke Koga, Owen A. Ross, Myron Weiner, Anne Lipton, James M. Powers, Charles L. White III, Dennis W. Dickson

Published in: Acta Neuropathologica | Issue 1/2015

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Abstract

Multiple system atrophy (MSA) is a sporadic neurodegenerative disease clinically characterized by cerebellar signs, parkinsonism, and autonomic dysfunction. Pathologically, MSA is an α-synucleinopathy affecting striatonigral and olivopontocerebellar systems, while neocortical and limbic involvement is usually minimal. In this study, we describe four patients with atypical MSA with clinical features consistent with frontotemporal dementia (FTD), including two with corticobasal syndrome, one with progressive non-fluent aphasia, and one with behavioral variant FTD. None had autonomic dysfunction. All had frontotemporal atrophy and severe limbic α-synuclein neuronal pathology. The neuronal inclusions were heterogeneous, but included Pick body-like inclusions. The latter were strongly associated with neuronal loss in the hippocampus and amygdala. Unlike typical Pick bodies, the neuronal inclusions were positive on Gallyas silver stain and negative on tau immunohistochemistry. In comparison to 34 typical MSA cases, atypical MSA had significantly more neuronal inclusions in anteromedial temporal lobe and limbic structures. While uncommon, our findings suggest that MSA may present clinically and pathologically as a frontotemporal lobar degeneration (FTLD). We suggest that this may represent a novel subtype of FTLD associated with α-synuclein (FTLD-synuclein).
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Metadata
Title
Atypical multiple system atrophy is a new subtype of frontotemporal lobar degeneration: frontotemporal lobar degeneration associated with α-synuclein
Authors
Naoya Aoki
Philip J. Boyer
Cheryl Lund
Wen-Lang Lin
Shunsuke Koga
Owen A. Ross
Myron Weiner
Anne Lipton
James M. Powers
Charles L. White III
Dennis W. Dickson
Publication date
01-07-2015
Publisher
Springer Berlin Heidelberg
Published in
Acta Neuropathologica / Issue 1/2015
Print ISSN: 0001-6322
Electronic ISSN: 1432-0533
DOI
https://doi.org/10.1007/s00401-015-1442-z

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