Presurgical mapping with magnetic source imaging: comparisons with intraoperative findings

Area of Science:

• Neurosurgery
• Neuroimaging
• Brain Mapping

Background:

• Intraoperative mapping is crucial for identifying critical brain functional centers.
• Noninvasive neuroimaging techniques like magnetic source imaging (MSI) and functional magnetic resonance imaging (fMRI) are explored as alternatives.
• Accurate preoperative mapping is essential for patients with brain tumors to minimize neurological deficits.

Purpose of the Study:

• To directly compare the efficacy of noninvasive preoperative magnetic source imaging (MSI) with intraoperative cortical stimulation mapping.
• To evaluate MSI as a surrogate for identifying sensorimotor and language-specific brain functional centers.
• To assess the concordance between MSI and intraoperative mapping for somatosensory areas.

Main Methods:

• Direct comparison of MSI and intraoperative cortical stimulation mapping in 17 patients.
• Preoperative and postoperative somatosensory mapping of 22 comparable anatomic sites (digits, face).
• Analysis of concordance rates between noninvasive MSI and invasive intraoperative mapping findings.

Main Results:

• Magnetic source imaging (MSI) results demonstrated reasonable concordance with intraoperative mapping in over 90% of cases.
• A
• good
• level of concordance was observed in 77% of the evaluated cases.
• MSI provided a viable, albeit coarse, identification of somatosensory areas.

Conclusions:

• Magnetic source imaging (MSI) is a valuable noninvasive tool for preoperative brain mapping.
• MSI can effectively guide and potentially reduce the duration of intraoperative mapping procedures.
• This technique aids in the identification of sensorimotor functional centers, improving surgical planning for brain tumor patients.