Meta-analysis of magnetic resonance imaging studies of the corpus callosum in bipolar disorder

D. Arnone, A. M. McIntosh, P. Chandra, K. P. Ebmeier

Research output: Contribution to journalLiterature reviewpeer-review

Abstract / Description of output

Objective: The corpus callosum (CC) plays a pivotal role in inter-hemispheric transfer and integration of information and is a relatively understudied structure in bipolar disorder (BD). Magnetic resonance imaging (MRI) studies have reported callosal abnormalities in this condition but findings have been inconsistent. Structural changes affecting the CC may underlie functional abnormalities in BD and could contribute to, or explain the pathophysiology of, the condition.

Method: A systematic review was carried out to identify, appraise and summarize MRI studies which compared callosal areas in BD with an unrelated control group. The findings were then synthesized using random effects meta-analysis. Consideration was given to a number of variables to explain heterogeneity.

Results: Five case-control studies were identified. Bipolar patients showed reduced callosal areas in comparison with healthy volunteers with no evidence of heterogeneity or publication bias.

Conclusion: Findings from this study indicate that callosal areas are reduced in BD and suggest that a failure to integrate information across the hemispheres may contribute to the pathophysiology of the disorder. Further research is necessary to clarify the underlying cellular changes leading to these morphometric differences.

Original languageEnglish
Pages (from-to)357-362
Number of pages6
JournalActa Psychiatrica Scandinavica
Issue number5
Publication statusPublished - Nov 2008


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