Direct stereotactic targeting of the globus pallidus: an MRI-based anatomic variability study

Area of Science:

• Neuroimaging
• Neuroanatomy
• Stereotactic Surgery

Background:

• The globus pallidus is a critical deep brain structure targeted in various neurosurgical interventions.
• Accurate anatomical localization is essential for safe and effective stereotactic procedures.
• Understanding the spatial relationship between the globus pallidus and surrounding structures like the optic tract is crucial.

Purpose of the Study:

• To investigate the anatomical variability of the globus pallidus in relation to the optic tract and commissures.
• To assess the reliability of MRI for imaging the globus pallidus.
• To inform stereotactic targeting strategies for improved safety and precision.

Main Methods:

• T1-weighted gradient echo 3D volume acquisition MRI was performed on 20 patients.
• Imaging data underwent resizing, reformatting, and manual segmentation of key structures.
• Mean values and standard deviations for the limits of the globus pallidus, optic tract, and commissures were determined.

Main Results:

• The globus pallidus was consistently and reliably visualized using MRI.
• Significant anatomical variability (up to several millimeters) was observed in the spatial relationships.
• The study established reliable imaging parameters for the globus pallidus.

Conclusions:

• MRI provides a reliable method for imaging the globus pallidus, accommodating normal anatomical variability.
• Stereotactic targeting of the globus pallidus can be refined by considering individual anatomical differences.
• This imaging approach may reduce the risk of inadvertent optic tract injury during neurosurgery.