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Targeting Neuronal Fiber Tracts for Deep Brain Stimulation Therapy Using Interactive, Patient-Specific Models

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[Anterior Thalamic Deep Brain Stimulation Therapy Based on Functional Anatomy].

Tomotaka Ishizaki¹, Satoshi Maesawa, Ryuta Saito

¹Department of Neurosurgery, Nagoya University Graduate School of Medicine.

No Shinkei Geka. Neurological Surgery

|December 9, 2025

Summary

Deep brain stimulation (DBS) of the anterior nucleus of the thalamus (ANT) shows promise for epilepsy. Precise targeting using the ANT-mammillothalamic tract (MTT) junction is crucial for effective seizure control.

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Area of Science:

Neurology
Neurosurgery
Epilepsy Research

Background:

Deep brain stimulation (DBS) targeting the anterior nucleus of the thalamus (ANT) is a potential treatment for drug-resistant epilepsy.
ANT-DBS is believed to modulate epileptic activity via the cingulate gyrus, Papez circuit, and default mode network.
The anteroventral nucleus (AV) within ANT is a key target due to its limbic system connectivity, but direct MRI visualization is difficult.

Purpose of the Study:

To highlight the importance of precise targeting in ANT-DBS for epilepsy treatment.
To identify practical imaging landmarks for accurate surgical placement of DBS electrodes in the ANT.
To evaluate the significance of stimulation site accuracy over stimulation parameters for seizure outcome.

Main Methods:

Review of current understanding of ANT-DBS mechanisms and targeting strategies.
Discussion of surgical approaches (transventricular vs. extraventricular) for ANT-DBS.
Emphasis on the utility of the ANT-mammillothalamic tract (MTT) junction as an identifiable imaging landmark.

Main Results:

The ANT-MTT junction is a reliable landmark for surgical targeting of ANT-DBS.
The transventricular approach may provide superior electrode placement accuracy.
Evidence suggests seizure outcomes correlate more strongly with stimulation site precision than stimulation parameters.

Conclusions:

Image-guided targeting of the ANT-MTT junction is critical for optimizing outcomes in ANT-DBS for epilepsy.
Accurate electrode placement is paramount for maximizing the therapeutic benefits of DBS.
Further refinement of surgical techniques and targeting strategies is essential for advancing DBS therapy in epilepsy.