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Methodology of electrode implantations. A and B: Planning of electrode trajectories using navigation software. C: Coordinates of the Leksell frame are set by the operating neurosurgeon. D: Introduction of the stylet through the guiding screw to a premeasured length to create the electrode tract. E: Insertion of the depth electrode through the screw. F: Aspect at the end of the procedure, after implantation of 13 depth electrodes and placement of fixation bolts
