Magnetic resonance imaging ‐negative type II focal cortical dysplasia as a subtle form of bottom‐of‐sulcus dysplasia: Electrophysiological and histopathological evidence and treatment implications

MRI-negative type II FCD exhibits sulcus bottom-centered epileptogenicity, consistent with a subtle form of BOSD. These findings support sulcus bottom-targeted MRgLITT as a safe and effective minimally invasive therapy and provide a rationale for sulcus bottom-centered surgical planning in MRI-negative FCD II.