Article
Focal cortical dysplasia as a challenge for the epilepsy surgeon: could multimodal neuronavigation help?
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Published: | June 9, 2017 |
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Objective: Focal cortical dysplasia (FCD) one of the major causes of drug-resistant epilepsy. As long-term seizure control after surgery still remains disappointing, we evaluated our patient cohort using functional neuronavigation and intraoperative 1.5T-MRI (iopMRI).
Methods: In this retrospective study, 66 patients (33 female, 33 male, mean age 36.4 ± 12.7 yrs) with FCD and drug-resistant epilepsy underwent surgery in our Department between 2/2003 and 10/2016. Mean duration of epilepsy was 20.7 ± 12.9 years. Surgery was performed with the aid of neuronavigation and intraoperative 1.5T-iopMRI. Additional functional MR imaging (motor, memory and speech areas) and diffusion tensor imaging (DTI) for tracking neuronal fibers (language and pyramidal tracts) was acquired in 25 patients. We integrated three-dimensional intraoperative visualization of phase-2 electrodes in 15 patients.
Results: Of 66 patients undergoing surgery, complete resection was achieved in 91% (60/66). Remnant tissue according to the resection plan was detected with iopMRI in 13 patients (20%). After intraoperative update of neuronavigation, eight of these 13 patients undergoing re-resection were seizure free. Overall, complete seizure control (Engel Class IA) was 64% (42/66, mean FU 52.5 ± 33.1 months). Five patients had a permanent (6%, 4/66) and two patient a transient postoperative neurological deficit (5%, 3/66).
Conclusion: Epilepsy surgery in patients with FCDs can be enhanced with the aid of multimodal neuronavigation, leading to promising long-term seizure control. As a direct consequence of intraoperative MR imaging, the rate of complete resections of pathological tissue as well as the number of potentially seizure-free patients can be increased.