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A/B. MEG sources in relation to resection cavities in patients with two surgeries: A: patient 11; continuing seizures after 1st surgery, sustained seizure freedom after 2nd surgery years later. As illustrated, the 2nd surgery (lower row, intraoperative MRI) included the MEG-source, which had remained unresected by the 1st intervention; B: patient 1: persisting seizures after 2nd surgery, MEG source in unresected edge area despite large resection volume.
