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Updated: Feb 3, 2026
Full-Endoscopic Surgery for Hypothalamic Hamartoma Resection
Published on: April 12, 2024
Subcentimeter epilepsy surgery targets by resting state functional magnetic resonance imaging can improve outcomes in
Varina L Boerwinkle1, Stephen T Foldes2, Salvatore J Torrisi3
1Division of Pediatric Neurology, Barrow Neurological Institute at Phoenix Children's Hospital, Phoenix, Arizona.
Insights
Epilepsy surgery using resting-state functional MRI (rs-fMRI) to target the seizure onset zone in hypothalamic hamartoma significantly improved seizure freedom by 45% compared to conventional methods, with no complications.
Area of Science:
- Neurology
- Neurosurgery
- Medical Imaging
Background:
- Intractable epilepsy in children with hypothalamic hamartoma (HH) presents significant treatment challenges.
- Conventional treatments often have limited efficacy and potential for complications.
Purpose of the Study:
- To investigate the efficacy of epilepsy surgery targeting subcentimeter-sized epileptogenic zones (EZs) identified by resting-state functional MRI (rs-fMRI) in children with hypothalamic hamartoma (HH).
Main Methods:
- Fifty-one children with HH-related epilepsy underwent stereotactic laser ablation (SLA).
- Thirty-six patients had their EZs preoperatively guided by rs-fMRI, while 15 control subjects (CS) did not.
- Outcomes assessed included seizure frequency reduction and Engel Epilepsy Surgery Outcome Scale at 1 year post-surgery.
Main Results:
- The rs-fMRI guided group (RS) achieved 85% seizure reduction versus 49% in CS (P = 0.0006).
- Class I Engel outcomes (freedom from disabling seizures) were achieved in 92% of the RS group compared to 47% in CS, a 45% improvement (P = 0.001).
- No postoperative morbidity or mortality occurred in the RS group.
Conclusions:
- Surgical targeting of rs-fMRI-identified EZs in HH is a novel and highly effective approach for intractable epilepsy.
- This technique offers superior seizure freedom rates and reduced morbidity compared to conventional methods.
- The study demonstrates the highest seizure freedom rate for this condition without surgical complications.
Objective:
The purpose of this study is to investigate the outcomes of epilepsy surgery targeting the subcentimeter-sized resting state functional magnetic resonance imaging (rs-fMRI) epileptogenic onset zone (EZ) in hypothalamic hamartoma (HH).
Methods:
Fifty-one children with HH-related intractable epilepsy received anatomical MRI-guided stereotactic laser ablation (SLA) procedures. Fifteen of these children were control subjects (CS) not guided by rs-fMRI. Thirty-six had been preoperatively guided by rs-fMRI (RS) to determine EZs, which were subsequently targeted by SLA. The primary outcome measure for the study was a predetermined goal of 30% reduction in seizure frequency and improvement in class I Engel outcomes 1 year postoperatively. Quantitative and qualitative volumetric analyses of total HH and ablated tissue were also assessed.
Results:
In the RS group, the EZ target within the HH was ablated with high accuracy (>87.5% of target ablated in 83% of subjects). There was no difference between the groups in percentage of ablated hamartoma volume (P = 0.137). Overall seizure reduction was higher in the rs-fMRI group: 85% RS versus 49% CS (P = 0.0006, adjusted). The Engel Epilepsy Surgery Outcome Scale demonstrated significant differences in those with freedom from disabling seizures (class I), 92% RS versus 47% CS, a 45% improvement (P = 0.001). Compared to prior studies, there was improvement in class I outcomes (92% vs 76%-81%). No postoperative morbidity or mortality occurred.
Significance:
For the first time, surgical SLA targeting of subcentimeter-sized EZs, located by rs-fMRI, guided surgery for intractable epilepsy. Our outcomes demonstrated the highest seizure freedom rate without surgical complications and are a significant improvement over prior reports. The approach improved freedom from seizures by 45% compared to conventional ablation, regardless of hamartoma size or anatomical classification. This technique showed the same or reduced morbidity (0%) compared to recent non-rs-fMRI-guided SLA studies with as high as 20% permanent significant morbidity.
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