RESUMEN
BACKGROUND: Neurosurgical treatment of severe bilateral occipital lobe epilepsy usually involves two operations several mos apart. AIM: To evaluate surgical resection of bilateral occipital lobe lesions during a single operation as a treatment for bilateral occipital lobe epilepsy. METHODS: This retrospective case series included patients with drug-refractory bilateral occipital lobe epilepsy treated surgically between March 2006 and November 2015. RESULTS: Preoperative evaluation included scalp video-electroencephalography (EEG), magnetic resonance imaging, and PET-CT. During surgery (bilateral occipital craniotomy), epileptic foci and important functional areas were identified by EEG (intracranial cortical electrodes) and cortical functional mapping, respectively. Patients were followed up for at least 5 years to evaluate treatment outcome (Engel grade) and visual function. The 20 patients (12 males) were aged 4-30 years (median age, 12 years). Time since onset was 3-20 years (median, 8 years), and episode frequency was 4-270/mo (median, 15/mo). Common manifestations were elementary visual hallucinations (65.0%), flashing lights (30.0%), blurred vision (20.0%) and visual field defects (20.0%). Most patients were free of disabling seizures (Engel grade I) postoperatively (18/20, 90.0%) and at 1 year (18/20, 90.0%), 3 years (17/20, 85.0%) and ≥ 5 years (17/20, 85.0%). No patients were classified Engel grade IV (no worthwhile improvement). After surgery, there was no change in visual function in 13/20 (65.0%), development of a new visual field defect in 3/20 (15.0%), and worsening of a preexisting defect in 4/20 (20.0%). CONCLUSION: Resection of bilateral occipital lobe lesions during a single operation may be applicable in bilateral occipital lobe epilepsy.
RESUMEN
BACKGROUND: Anterior temporal lobectomy (ATL) is the standard surgical treatment for temporal lobe epilepsy (TLE), but patients may suffer from recurrent seizures post-surgery. Invasive electrical monitoring plays a critical role in precisely identifying the epileptic foci. This study aimed to evaluate and compare the benefits of long-term invasive electroencephalography (EEG) monitoring and two-stage surgery with the classical approach to examine their effect on post-surgical brain function and complications. MATERIALS AND METHODS: Patients with TLE (Nâ¯=â¯198) who underwent epilepsy surgery were retrospectively evaluated. Diagnosis of TLE was confirmed based on clinical grounds (semiology), EEG findings, and magnetic resonance imaging (MRI). Long-term invasive video EEG was performed; epileptiform discharges were recorded. Patients underwent either classical ATL or modified two-step surgery with electrodes implantation. Histopathological examination was performed. The patients were followed up at 1, 3, and 5 years after surgery. RESULTS: Twenty-three and 175 patients underwent classical ATL and two-stage surgery, respectively. On histopathological examination, inflammation, hippocampal sclerosis, and cortical dysplasia were found to be the leading pathological causes of epileptic foci in both groups. MRI results were not consistent with the pathological findings. Grade II and III Engel scores were more frequent in the ATL group compared to two-stage surgery during follow-up. No postoperative complications were reported in two-stage surgery during follow-up, but one patient had mild hemiplegia in the ATL group. CONCLUSIONS: Preoperative invasive monitoring with long-term EEG helps locate the epileptic foci precisely. Postsurgical complications are rare compared to classical ATL, with better prognosis and seizure freedom after surgery.