Epilepsy surgery is an evidence-based treatment for drug-refractory focal epilepsy [1,2]. However, not every patient’s epilepsy is similarly amenable to surgery and success rates vary depending on epilepsy type and other patient characteristics. To assess outcome after epilepsy surgery two classifications are used. The Engel classification assesses the total period after surgery [3] whereas the ILAE classification assesses a defined period, for example since the last follow-up [4].
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