MRI-guided stereotactic laser corpus callosotomy for epilepsy: distinct methods and outcomes

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  • 1 Emory University School of Medicine; Departments of
  • 2 Neurology,
  • 3 Neurosurgery, and
  • 4 Radiology, Emory University School of Medicine, Atlanta, Georgia;
  • 5 Department of Neurosurgery, Texas Children’s Hospital, Houston, Texas; and
  • 6 Department of Neurological Surgery, Washington University School of Medicine, St. Louis, Missouri
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OBJECTIVE

Several small series have described stereotactic MRI-guided laser interstitial thermal therapy for partial callosotomy of astatic and generalized tonic-clonic (GTC) seizures, especially in association with Lennox-Gastaut syndrome. Larger case series and comparison of distinct stereotactic methods for stereotactic laser corpus callosotomy (SLCC), however, are currently lacking. The objective of this study was to report seizure outcomes in a series of adult patients with epilepsy following anterior, posterior, and complete SLCC procedures and to compare the results achieved with a frameless stereotactic surgical robot versus direct MRI guidance frames.

METHODS

The authors retrospectively reviewed sequential adult epilepsy surgery patients who underwent SLCC procedures at a single institution. They describe workflows, stereotactic errors, percentage disconnection, hospitalization durations, adverse events, and seizure outcomes after performing anterior, posterior, and complete SLCC procedures using a frameless stereotactic surgical robot versus direct MRI guidance platforms.

RESULTS

Thirteen patients underwent 15 SLCC procedures. The median age at surgery was 29 years (range 20–49 years), the median duration of epilepsy was 21 years (range 9–48 years), and median postablation follow-up was 20 months (range 4–44 months). Ten patients underwent anterior SLCC with a median 73% (range 33%–80%) midsagittal length of callosum acutely ablated. Following anterior SLCC, 6 of 10 patients achieved meaningful (> 50%) reduction of target seizures. Four patients underwent posterior (completion) SLCC following prior anterior callosotomy, and 1 patient underwent complete SLCC as a single procedure; 3 of these 5 patients experienced meaningful reduction of target seizures. Overall, 8 of 10 patients in whom astatic seizures were targeted and treated by anterior and/or posterior SLCC experienced meaningful improvement. SLCC procedures with direct MRI guidance (n = 7) versus a frameless surgical robot (n = 8) yielded median radial accuracies of 1.1 mm (range 0.2–2.0 mm) versus 2.4 mm (range 0.6–6.1 mm; p = 0.0011). The most serious adverse event was a clinically significant intraparenchymal hemorrhage in a patient who underwent the robotic technique.

CONCLUSIONS

This is the largest reported series of SLCC for epilepsy to date. SLCC provides seizure outcomes comparable to open surgery outcomes reported in the literature. Direct MRI guidance is more accurate, which has the potential to reduce the risks of SLCC. Methodological advancements and larger studies are needed.

ABBREVIATIONS DBS = deep brain stimulation; GTC = generalized tonic-clonic; LGS = Lennox-Gastaut syndrome; LOS = length of stay; MRg-LITT = MRI-guided laser interstitial thermal therapy; ROSA = Robotic Stereotactic Assistant; SGE = symptomatic generalized epilepsy; SLCC = stereotactic laser corpus callosotomy; T2IR = T2 inversion recovery; VNS = vagus nerve stimulation; VP = ventriculoperitoneal.

Supplementary Materials

    • Supplemental Figure (PDF 357 KB)

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Contributor Notes

Correspondence Jon T. Willie: Washington University School of Medicine and Barnes-Jewish Hospital, St. Louis, MO. jontwillie@wustl.edu.

INCLUDE WHEN CITING Published online January 22, 2021; DOI: 10.3171/2020.7.JNS20498.

Disclosures Dr. Curry reports being a consultant to Medtronic, Inc. Dr. Gross reports being a consultant to Medtronic, and receiving support of non–study-related clinical or research effort from Medtronic. Dr. Willie reports being a consultant to Medtronic, ClearPoint Neuro, NeuroPace, AIMM Therapeutics, and NICO Medical, and receiving support of non–study-related clinical or research effort from Medtronic, NeuroPace, and NICO Medical.

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