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Preoperative Cortical Mapping for Brain Tumor Surgery Using Navigated Transcranial Stimulation: Analysis of Accuracy.

Wellingson Silva Paiva1, Erich Talamoni Fonoff1, Rhuann Pontes Dos Santos Silva2

  • 1Neurosurgery Division, University of São Paulo, São Paulo 14040-906, Brazil.

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|September 28, 2024
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Summary

Navigated transcranial magnetic stimulation (TMS) accurately maps the motor cortex, showing high similarity to direct electrical stimulation (DES) during brain surgery. This non-invasive technique is a promising tool for preoperative functional mapping.

Keywords:
brain neoplasmsmotor cortextranscranial magnetic stimulation

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Area of Science:

  • Neurosurgery
  • Neuroscience
  • Medical Imaging

Background:

  • Transcranial magnetic stimulation (TMS) is a non-invasive brain stimulation technique.
  • Advancements in image processing allow integration of magnetic resonance imaging (MRI) with TMS via neuronavigation.
  • Cortical mapping is crucial for neurosurgical procedures involving eloquent brain areas.

Purpose of the Study:

  • To evaluate the efficacy of navigated TMS for cortical mapping.
  • To compare navigated TMS with direct electrical stimulation (DES) for surgical mapping.
  • To assess the precision and reliability of navigated TMS in motor cortex tumor surgery.

Main Methods:

  • The study included 30 neurosurgical procedures for tumors near the precentral gyrus.
  • Navigated TMS was used for cortical mapping.
  • Direct electrical stimulation (DES) was employed for surgical mapping.
  • Comparison of TMS and DES points using vectorial module distances.

Main Results:

  • Navigated TMS and DES showed notable similarity in mapping points.
  • The mean distance between TMS and DES geometric centers was 4.85 ± 1.89 mm.
  • A strong correlation (r = 0.901, p < 0.001) was found between TMS and DES points.
  • Motor threshold was significantly higher in tumor-adjacent motor cortex compared to normal cortex (p < 0.001).
  • Both methods demonstrated excellent accuracy in patients with existing deficits.

Conclusions:

  • Navigated TMS is a reliable and precise method for brain mapping.
  • It shows significant promise as a preoperative functional mapping tool in motor cortex tumor surgery.
  • The integration of MRI with TMS via neuronavigation enhances its applicability in complex neurosurgical cases.