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Epilepsy surgery: eligibility criteria and presurgical evaluation Ryvlin P; Rheims SDialogues Clin Neurosci 2008[]; 10 (1): 91-103Epilepsy surgery has benefited from major advances during the last 20 years, thanks to the development of neuroimaging and long-term video-electroencephalographic (EEG) monitoring. However, it remains the case that only a small minority of potential epilepsy surgery candidates will have access to a comprehensive presurgical evaluation. Furthermore, this subset of patients are operated on after an average of 20 to 25 years of epilepsy duration. Among the various reasons that prevent many patients from benefiting from a timely presurgical evaluation, we need to emphasize the role of inaccurate information regarding eligibility criteria and lack of standardized practice. This review aims at providing an in-depth discussion of the current views regarding the definition of surgical candidates, and the role of the numerous investigations used in the presurgical evaluation of patients with drug-resistant epilepsy. The eligibility criteria required to enter a presurgical evaluation in 2008 should be relatively liberal, provided that the patient suffers from disabling seizures unrelated to an idiopathic generalized epileptic syndrome, despite appropriate antiepileptic drug treatment. However, the decision as to whether or not to perform a presurgical evaluation must be individualized, and take into account the likelihood of meeting the patient's expectations in terms of outcome. These expectations need to be balanced with the apparent severity of the epileptic condition, the chance of achieving a successful surgical treatment, and the risk of a postoperative neurological, cognitive, or psychiatric deterioration. The roles and specific features of the main types of presurgical investigations are reviewed.|Brain/diagnostic imaging/physiopathology/surgery[MESH]|Diagnostic Imaging/methods/standards[MESH]|Drug Resistance[MESH]|Electrodiagnosis/methods/standards[MESH]|Epilepsy/*surgery[MESH]|Humans[MESH]|Neurosurgical Procedures/*methods/*standards[MESH]|Patient Selection[MESH]|Preoperative Care/*methods/*standards[MESH]|Radionuclide Imaging[MESH]|Risk Assessment[MESH] |
