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• W4283015124 abstract "Introduction Multiple system atrophy (MSA) typically presents with parkinsonism, ataxia and/or autonomic dysfunction. Occasionally, clinically atypical (ca-MSA) cases masquerade as progressive supranuclear palsy (PSP). We aimed to investigate whether different neuroimaging modalities could facilitate differentiation and whether histopathologic characteristics could explain the atypical presentation. Methods We identified 3 neuropathologically-defined ca-MSA patients with clinically diagnosed PSP who underwent various antemortem brain imaging: MRI and PET imaging using 11C-Pittsburgh compound B, 18F-flortaucipir, and 18F-fluorodeoxyglucose. We compared clinical features, brainstem planimetry, and radiotracer standardized uptake value ratios in ca-MSA to 10 autopsy-confirmed PSP patients and 10 healthy controls (imaging only). We also compared histologic count of neuronal loss, iron deposition and α -synuclein-immunoreactive glial cytoplasmic inclusion burden to 10 autopsy-confirmed MSA-parkinsonism (MSA-P) cases. Results Ca-MSA had better PSP Saccadic Impairment Scale scores (p = 0.003) and more frequent good levodopa response (p = 0.061) than PSP. Ca-MSA showed higher midbrain-to-pons ratio and lower Magnetic Resonance Parkinsonism Index than PSP (each, p = 0.036) and exhibited lower glucose metabolism in the putamen and globus pallidus versus PSP (p = 0.017) and controls (p = 0.007). These same regions showed higher flortaucipir uptake in ca-MSA than PSP (p = 0.007 for putamen, p = 0.049 for pallidum) and controls (p = 0.012). Lower flortaucipir retention was observed in the subthalamic nucleus versus PSP (p = 0.007). The putamen-to-subthalamic ratio distinguished ca-MSA from PSP. No histopathological differences were observed for ca-MSA versus typical MSA-P. Conclusion Severity of saccadic impairment, levodopa responsiveness, MRI planimetric measurements, and different patterns of fluorodeoxyglucose and flortaucipir uptake can help improve antemortem differentiation of MSA masquerading as PSP from true PSP." @default.
• W4283015124 created "2022-06-18" @default.
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• W4283015124 date "2022-08-01" @default.
• W4283015124 modified "2023-10-15" @default.
• W4283015124 title "Tau-PET and multimodal imaging in clinically atypical multiple system atrophy masquerading as progressive supranuclear palsy" @default.
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• W4283015124 doi "https://doi.org/10.1016/j.parkreldis.2022.06.008" @default.
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