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- Title
Quantitative assessment of subcortical atrophy and iron content in progressive supranuclear palsy and parkinsonian variant of multiple system atrophy.
- Authors
Lee, Jae-Hyeok; Han, Yong-Hee; Kang, Bok-Man; Mun, Chi-Woong; Lee, Sang-Jae; Baik, Seung-Kug
- Abstract
It is a matter of debate whether increased brain iron levels are the cause or only the consequence of neurodegenerative process in degenerative parkinsonism. The aim of this study is to characterize disease-related changes in volumes and iron-related R2* values of basal ganglia and thalamus. 13 patients with progressive supranuclear palsy (PSP), 15 with a parkinsonian variant of multiple system atrophy (MSA-p), 29 with Parkinson's disease (PD), and 21 age-matched controls underwent 3-Tesla MRI. The R2* values and volumes were calculated for the selected subcortical structures (caudate nucleus, putamen, globus pallidus, and thalamus) using an automated region-based analysis. Voxel-based analysis was also performed to visualize a topographical correlation of R2* value and volume. The PSP group had significantly higher R2* values in globus pallidus and caudate nucleus ( p < 0.05), whereas the MSA-p group had higher R2* values in putamen ( p < 0.001) than PD and controls. The globus pallidus in PSP and the putamen in MSA-p were the most significant areas of atrophy to differentiate PSP, MSA-p and PD (AUC = 0.856, 0.832, respectively, p < 0.001). The R2* values in both structures increased in parallel with the extent of atrophy. They were negatively correlated with volumes in putamen ( r = −0.777, p < 0.001) and globus pallidus ( r = −0.409, p = 0.025) of MSA-p, and globus pallidus ( r = −0.4, p = 0.043) of PSP. Voxel-based analysis identified higher R2* values in more severely atrophic sub-regions in these structures. We observed topographical differences of iron deposition as well as atrophy between MSA-p and PSP. Increased iron levels were related to the structural atrophy in basal ganglia. Our results imply that iron accumulation is likely an epiphenomenon of the degenerative process.
- Subjects
MUSCULAR atrophy; PROGRESSIVE supranuclear palsy; PARKINSONIAN disorders; MAGNETIC resonance imaging; GLOBUS pallidus; SCIENTIFIC observation
- Publication
Journal of Neurology, 2013, Vol 260, Issue 8, p2094
- ISSN
0340-5354
- Publication type
Article
- DOI
10.1007/s00415-013-6951-x