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Anatomic Investigation of the Trajectory for Stereotactic Laser Amygdalohippocampectomy
Vanessa M Holanda1, Abuzer Gungor2, Serhat Baydin3
1Center of Neurology and Neurosurgery Associates (NeuroCENNA), Beneficência Portuguesa of São Paulo Hospital, São Paulo-SP, Brazil.
Background:
Magnetic resonance imaging-guided laser interstitial thermal therapy (LITT) has emerged as a promising treatment for mesial temporal lobe epilepsy. Surgeons must understand the relevant anatomy that is traversed by the catheter and affected by ablation.
Objective:
To study the anatomic structures crossed by the LITT catheter until it reaches the amygdala.
Methods:
Three human cadaveric heads were implanted with catheters using a frameless stereotactic technique. The Visualase® system (Medtronic, Dublin, Ireland) was utilized to ablate along the trajectory. Coronal and oblique axial slices were created. Fiber tract dissections were performed in a lateral-medial and inferior-superior scheme. Magnetic resonance tractography was acquired to illustrate the tracts dissected.
Results:
Entry points occurred within 4 cm of the transverse and sagittal sinus, inferior to the lambdoid suture. The cortex of the inferior occipital gyrus was crossed in the region of the transverse occipital sulcus. The vertical occipital fasciculus was crossed en route to passing through the optic radiations. The catheter crossed through or inferior to the optic radiations before piercing the parahippocampal gyrus at about 4 cm from the skull. The catheter entered the hippocampus as it pierced the superior margin of the parahippocampus at 6 cm. The catheter entered the head of the hippocampus to lie inferolateral to the amygdala in the last centimeter of the trajectory.
Conclusion:
Understanding the anatomic principles of LITT catheter trajectories will improve the ability to perform this procedure. The current study is the first to examine the anatomy of this trajectory and will serve as the basis for future studies.
Insights
This study maps the path of laser interstitial thermal therapy (LITT) catheters to the amygdala for epilepsy treatment. Understanding these precise anatomical trajectories is crucial for surgical success.
Area of Science:
- Neurosurgery
- Medical Imaging
- Epilepsy Treatment
Background:
- Laser interstitial thermal therapy (LITT) guided by magnetic resonance imaging (MRI) is a key treatment for mesial temporal lobe epilepsy.
- Accurate surgical navigation requires detailed knowledge of the anatomy encountered by LITT catheters.
Purpose of the Study:
- To delineate the specific anatomical structures traversed by LITT catheters during amygdala-targeted ablation for epilepsy.
Main Methods:
- Utilized a frameless stereotactic technique to implant catheters in three human cadaveric heads.
- Employed the Visualase® system for ablation along the trajectory, followed by coronal/oblique axial slicing and fiber dissection.
- Acquired MRI tractography to visualize dissected fiber tracts.
Main Results:
- Catheter entry points were near the transverse and sagittal sinuses, inferior to the lambdoid suture.
- The trajectory crossed the inferior occipital gyrus, vertical occipital fasciculus, and optic radiations.
- The catheter passed through the parahippocampal gyrus to reach the hippocampus, lying inferolateral to the amygdala.
Conclusions:
- Detailed understanding of LITT catheter anatomy enhances procedural precision for epilepsy treatment.
- This study provides foundational anatomical insights for LITT procedures targeting the amygdala.
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