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Cerebral hemispherectomy in pediatric patients with epilepsy: comparison of three techniques by pathological
Shon W Cook1, Snow T Nguyen, Bin Hu
1Division of Neurosurgery, Department of Anesthesiology, The Brain Research Institute, The Mental Retardation Research Center, David Geffen School of Medicine, University of California, Los Angeles, California, USA.
Insights
Comparing hemispherectomy techniques for pediatric epilepsy, the modified lateral hemispherotomy showed fewer perioperative risks and shorter hospital stays. Seizure control was similar across all methods, regardless of the underlying pathology.
Area of Science:
- Neurosurgery
- Pediatric Neurology
- Epileptology
Background:
- Cerebral hemispherectomy for intractable epilepsy has evolved, with modern techniques focusing on disconnection rather than resection.
- Increasingly, pediatric cases of cortical dysplasia and Rasmussen encephalitis undergo surgical treatment at younger ages.
- Limited comparative data exists on perioperative outcomes based on hemispherectomy technique and pathology in children.
Purpose of the Study:
- To compare perioperative differences in pediatric epilepsy patients undergoing anatomical hemispherectomy, functional hemispherectomy, and modified lateral hemispherotomy.
- To evaluate the impact of pathological substrates (cortical dysplasia, Rasmussen encephalitis, infarction/ischemia) on surgical outcomes.
- To assess if hemispherectomy technique or pathology influences postoperative seizure control.
Main Methods:
- Retrospective comparison of 125 pediatric patients stratified by disease.
- Surgical groups included anatomical hemispherectomy (37), functional hemispherectomy (32), and modified lateral hemispherotomy (46).
- Pathological diagnoses comprised cortical dysplasia (55), Rasmussen encephalitis (21), infarction/ischemia (27), and others (12).
Main Results:
- Modified lateral hemispherotomy demonstrated the least blood loss, shortest ICU stay, and lowest complication rate.
- Anatomical hemispherectomy was linked to longer hospital stays, delayed feeding, higher fevers, and increased shunt requirements.
- Functional hemispherectomy had the highest reoperation rate (25%); cortical dysplasia patients were youngest, had most blood loss, and longest operative times.
Conclusions:
- Perioperative risks and hospital course vary significantly by hemispherectomy technique and pathological substrate, but not by seizure control.
- The modified lateral hemispherotomy offers advantages in reduced blood loss and reoperation rates.
- These benefits are particularly relevant for young children with cortical dysplasia and Rasmussen encephalitis, especially those with ventricular anomalies.
Object:
Cerebral hemispherectomy for intractable seizures has evolved over the past 50 years, and current operations focus less on brain resection and more on disconnection. In addition, cases involving cortical dysplasia and Rasmussen encephalitis are being identified and surgically treated in younger individuals. Few studies have been conducted to compare whether there are perioperative differences based on hemispherectomy technique and/or pathological substrate in pediatric patients with epilepsy.
Methods:
In this study the authors compared, stratified by disease, anatomical (37 cases) and Rasmussen functional hemispherectomy (32 cases) with a new modified lateral hemispherotomy (46 cases). Pathological processes included cortical dysplasia (55 cases), Rasmussen encephalitis (21 cases), infarction/ischemia (27 cases), and other/miscellaneous (12 cases). The authors found differences in perioperative clinical factors based on operative technique and/or pathological substrate. In terms of technique, the lateral hemispherotomy was associated with the least intraoperative blood loss, shortest intensive care unit stay, and lowest complication rate. The anatomical hemispherectomy was associated with the longest hospital stay, delayed oral food intake, highest postsurgery fevers, and the highest incidence of shunt requirement. The functional hemispherectomy was associated with the highest reoperation rate for recurrent seizures (25%). In terms of pathology, patients with cortical dysplasia were the youngest at surgery, suffered the greatest amount of blood loss, and required the longest operative/anesthesia times compared with the other pathologically defined groups. Postoperative seizure control (range 0.5-2 years) was not statistically different according to technique or disease process and was similar to that in cases of pediatric temporal lobe epilepsy.
Conclusions:
The authors found differences in perioperative risks and hospital course but not postsurgery seizure control, which vary by hemispherectomy technique and/or disease process. The modified lateral hemispherotomy approach offers various advantages related to operative blood loss and reoperation compared with anatomical and functional hemispherectomies that are especially relevant in younger patients with cortical dysplasia and Rasmussen encephalitis with small and/or malformed ventricles.
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