Journal of Neurology

, Volume 260, Issue 7, pp 1846–1854 | Cite as

Volumetric and shape analysis of thalamus in idiopathic generalized epilepsy

  • Ji Hyun Kim
  • Jung Bin Kim
  • Woo-Keun Seo
  • Sang-il Suh
  • Seong-Beom Koh
Original Communication

Abstract

Previous studies using voxel-based morphometry (VBM) provided emerging evidence of structural changes of the thalamus in idiopathic generalized epilepsy (IGE). However, the location of atrophy within the thalamus in IGE has been somewhat inconsistent across the studies. We, therefore, examined the location of thalamic atrophy and its relationship with clinical factors in IGE, using multiple analytic methods. Fifty IGE patients and 50 controls were scanned on a 3T MRI. Structural evaluation consisted of automated thalamic volumetry, VBM, and thalamic shape analysis. Group comparison between patients and controls was made to assess thalamic atrophy. Within-group correlations between thalamic atrophy and clinical variables were further performed in patients. Both thalamic volumes were reduced in IGE patients, and were negatively correlated with disease duration. The VBM showed a significant regional grey matter volume reduction in bilateral anterior-medial thalami in patients compared to controls. Voxel values extracted from the anterior-medial thalamic cluster were negatively correlated with disease duration. Vertex-based shape analysis revealed regional atrophy on the anterior-medial and posterior-dorsal aspects of thalamus bilaterally in patients compared to controls. Correlation analysis showed that anterior-medial and posterior-dorsal aspects of bilateral thalami were negatively correlated with disease duration. Combining multiple analyses, we demonstrated regional atrophy of anterior-medial and posterior-dorsal thalamus in patients with IGE. Given the anatomical connection of these thalamic regions with the frontal lobe, our finding of greater thalamic atrophy in relation to increasing disease duration further supports the pathophysiological concept of thalamo-frontal network abnormality underlying IGE, and may implicate frontal cognitive dysfunctions and disease progression.

Keywords

Idiopathic generalized epilepsy Thalamus Voxel-based morphometry Vertex-based shape analysis 

Notes

Acknowledgments

This work was supported by the National Research Foundation of Korea Grant funded by the Korean Government (Grant No. 20100004827, 20110005418) and a Korea University Grant. The authors are very grateful to the participants for taking part in the present study.

Conflicts of interest

None.

Ethical standard

This study was approved by the local ethics committee, and made to conform to the latest guideline of the Declaration of Helsinki. All participants gave written informed consent prior to inclusion in the study.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Ji Hyun Kim
    • 1
  • Jung Bin Kim
    • 1
  • Woo-Keun Seo
    • 1
  • Sang-il Suh
    • 2
  • Seong-Beom Koh
    • 1
  1. 1.Department of Neurology, Korea University Guro HospitalKorea University College of MedicineSeoulRepublic of Korea
  2. 2.Department of Radiology, Korea University Guro HospitalKorea University College of MedicineSeoulRepublic of Korea

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