Figure 1. Interictal EEG (before vertical black line): spikes with phase reversal at C4/P4. Ictal EEG (after vertical black line): rhythmic activity with broad field, maximum at C4/P4. Filter settings: low frequency filter 1 Hz, high frequency filter 70 Hz, notch filter 50 Hz applied.
Figure 2. (a) CT brain scan before operation shows a large hypodense defect zone in the right frontal lobe with two metal fragments located in the defect zone. The right lateral ventricle is enlarged and drawn to the outward. (b) CT brain scan in the third postoperative day shows resection of pathological tissues and removal of metal fragments.