A) Post-operative seizure-freedom (Engel I outcome) was significantly more common in patients with concordant and specific MEG (85% seizure-free) than in patients with non-specific, lateralized-only, or discordant MEG (37% seizure-free overall, χ2 = 26.4, p < 0.001). Among patients with no spikes modelled, 72% were seizure-free after surgery. B) MEG findings stratified by seizure outcome. For details of these categories, see Fig. 2 legend. N = 132 patients. MEG: magnetoencephalography.