Neuroanatomical Considerations in Preoperative Functional Brain Mapping.

Area of Science:

• Neuroimaging
• Neurosurgery
• Radiology

Background:

• Task-based functional magnetic resonance imaging (fMRI) is crucial for presurgical assessment of eloquent cortex.
• fMRI's utility lies in its ability to map functional anatomy, which often differs from topographic anatomy, especially in cases of disease or chronic pathology.
• Understanding this dissociation is vital for surgical planning and preserving neurological function.

Purpose of the Study:

• To highlight the importance of fMRI in presurgical planning.
• To explain how fMRI noninvasively reveals individual functional brain anatomy.
• To emphasize the critical role of fMRI in guiding surgical trajectories and maximizing functional preservation.

Main Methods:

• Utilizing task-based functional magnetic resonance imaging (fMRI).
• Assessing eloquent cortex, including language, motor, vision, and memory systems.
• Interpreting activation patterns, considering both expected and bystander activations.

Main Results:

• fMRI provides a noninvasive method to delineate functional brain regions.
• It allows surgeons to optimize surgical approaches for complete resection while preserving function.
• Demonstrates the functional anatomy of critical brain systems like language and motor cortex.

Conclusions:

• fMRI is indispensable for presurgical mapping of eloquent cortex, especially when disease alters normal anatomy.
• Accurate interpretation requires understanding activation patterns and the technique's limitations.
• fMRI enhances surgical outcomes by providing crucial functional information for individualized patient care.