• Dario J Englot, Seunggu J Han, Mitchel S Berger, Nicholas M Barbaro, and Edward F Chang.
• Department of Neurological Surgery, University of California, San Francisco, California 94143-0112, USA.
• Neurosurgery. 2012 Apr 1; 70 (4): 921-8; discussion 928.

BackgroundAchieving seizure control in patients with low-grade temporal lobe gliomas or glioneuronal tumors remains highly underappreciated, because seizures are the most frequent presenting symptom and significantly impact patient quality-of-life.ObjectiveTo assess how the extent of temporal lobe resection influences seizure outcome.MethodsWe performed a quantitative, comprehensive systematic literature review of seizure control outcomes in 1181 patients with epilepsy across 41 studies after surgical resection of low-grade temporal lobe gliomas and glioneuronal tumors. We measured seizure-freedom rates after subtotal resection vs gross-total lesionectomy alone vs tailored resection, including gross-total lesionectomy with hippocampectomy and/or anterior temporal lobe corticectomy.ResultsIncluded studies were observational case series, and no randomized, controlled trials were identified. Although only 43% of patients were seizure-free after subtotal tumor resection, 79% of individuals were seizure-free after gross-total lesionectomy (OR = 5.00, 95% confidence interval [CI]: 3.33-7.14). Furthermore, tailored resection with hippocampectomy plus corticectomy conferred additional benefit over gross-total lesionectomy alone, with 87% of patients achieving seizure freedom (OR = 1.82, 95% CI: 1.23-2.70). Overall, extended resection with hippocampectomy and/or corticectomy over gross-total lesionectomy alone significantly predicted seizure freedom (OR = 1.18, 95% CI: 1.11-1.26). Age <18 years and mesial temporal location also prognosticated favorable seizure outcome.ConclusionGross-total lesionectomy of low-grade temporal lobe tumors results in significantly improved seizure control over subtotal resection. Additional tailored resection including the hippocampus and/or adjacent cortex may further improve seizure control, suggesting dual pathology may sometimes allow continued seizures after lesional excision.

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