Shape (but not volume) changes in the thalami in Parkinson disease

Martin J. McKeown, Ashish Uthama, Rafeef Abugharbieh, Samantha Palmer, Mechelle Lewis, Xuemei Huang

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62 Scopus citations


Background: Recent pathological studies have suggested that thalamic degeneration may represent a site of non-dopaminergic degeneration in Parkinson's Disease (PD). Our objective was to determine if changes in the thalami could be non-invasively detected in structural MRI images obtained from subjects with Parkinson disease (PD), compared to age-matched controls. Results: No significant differences in volume were detected in the thalami between eighteen normal subjects and eighteen PD subjects groups. However significant (p < 0.03) shape differences were detected between the Left vs. Right thalami in PD, between the left thalami in PD and controls, and between the right thalami in PD and controls using a recently-developed, spherical harmonic-based representation. Conclusion: Systematic changes in thalamic shape can benon-invasively assessed in PD in vivo. Shape changes, in addition to volume changes, may represent a new avenue to assess the progress of neurodegenerative processes. Although not directly discernable at the resolution of standard MRI, previous pathological studies would suggest that the shape changes detected in this study represent degeneration in the centre median-parafascicular (CM-Pf) complex, an area known to represent selective non-dopaminergic degeneration in PD.

Original languageEnglish (US)
Article number8
JournalBMC Neurology
StatePublished - Apr 16 2008

All Science Journal Classification (ASJC) codes

  • Clinical Neurology


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