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Cortical and subcortical brain shift during stereotactic procedures.

W Jeffrey Elias1, Kai-Ming Fu, Robert C Frysinger

  • 1Department of Neurological Surgery, University of Virginia Health System, Charlottesville, Virginia 22908, USA. wje4r@virginia.edu

Journal of Neurosurgery
|November 6, 2007
PubMed
Summary

Brain shift during stereotactic surgery is directly related to cerebrospinal fluid (CSF) loss, indicated by pneumocephalus. While significant shifts are uncommon, surgeons must prevent CSF loss to maintain accuracy.

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Area of Science:

  • Neurosurgery
  • Medical Imaging
  • Biomechanical Engineering

Background:

  • Stereotactic surgery relies on precise targeting, but intraoperative brain shift can cause significant errors.
  • Brain shift, a deformation of brain tissue, complicates accurate surgical navigation.
  • Understanding factors influencing brain shift is crucial for improving stereotactic surgical outcomes.

Purpose of the Study:

  • To quantify cortical and subcortical brain shift during stereotactic surgery.
  • To identify and assess variables that may influence the extent of brain shift.
  • To correlate specific clinical and imaging parameters with observed brain shift.

Main Methods:

  • Preoperative and postoperative MRI volumes were registered to calculate 3D deviation vectors for key anatomical landmarks (AC, PC, frontal cortex).
  • Potential influencing factors including patient demographics, surgical parameters, and postoperative pneumocephalus were analyzed.
  • Statistical correlations were performed between these variables and measured brain shift.

Main Results:

  • Brain shift, particularly in the posterior direction, was observed in cortical and subcortical regions.
  • Postoperative pneumocephalus volume showed a significant positive correlation with both frontal cortex (r=0.640) and anterior commissure (AC) shift (r=0.754).
  • No other analyzed factors, including ventricular penetration, were significantly correlated with AC shift.

Conclusions:

  • Cortical and subcortical brain shift during stereotactic procedures is a direct consequence of cerebrospinal fluid (CSF) loss, evidenced by pneumocephalus.
  • Clinically significant brain shifts appear to be infrequent.
  • Stereotactic surgeons must remain vigilant in strategies to minimize or prevent CSF loss during surgery.