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How do brain tumors alter functional connectivity? A magnetoencephalography study.

Fabrice Bartolomei1, Ingeborg Bosma, Martin Klein

  • 1Department of Clinical Neurophysiology, Vrije Universiteit Medical Center, Amsterdam, the Netherlands. fabrice.bartolomei@ap-hm.fr

Annals of Neurology
|November 10, 2005
PubMed
Summary

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Brain tumors disrupt brain network connectivity, leading to functional impairments. This loss of connectivity is more pronounced with left-sided tumors, affecting multiple brain regions.

Area of Science:

  • Neuroscience
  • Medical Imaging
  • Brain Network Analysis

Background:

  • Brain tumors can significantly impact neurological function.
  • Understanding the disruption of functional connectivity is crucial for diagnosing and treating brain tumors.

Purpose of the Study:

  • To investigate the hypothesis that brain tumors disrupt functional connectivity within brain networks.
  • To quantify the impact of brain tumors on functional connectivity using magnetoencephalography (MEG).

Main Methods:

  • Assessed functional connectivity via synchronization likelihood in broad (0.5-60Hz) and gamma (30-60Hz) bands.
  • Utilized magnetoencephalography (MEG) recordings from 17 brain tumor patients and 15 healthy controls at rest.
  • Constructed graphs of suprathreshold connections to identify regions with altered connectivity.

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Main Results:

  • Brain tumor patients exhibited a higher number of "missing connective points" compared to controls (p < 0.0001).
  • Left-sided tumors showed a more significant loss of connectivity than right-sided tumors (p = 0.008 broad band, p < 0.0001 gamma band).
  • Most patients displayed connectivity alterations in both affected and contralateral hemispheres.

Conclusions:

  • Brain tumors induce a significant loss of functional connectivity across multiple brain regions.
  • Left-hemisphere brain tumors appear to have more severe consequences on functional connectivity.
  • Findings highlight the disruption of brain networks as a key mechanism underlying tumor-induced functional deficits.