Estimated marginal means corrected for postconceptional age of parallel diffusion (A), perpendicular diffusion (B), apparent diffusion coefficient (C), and fractional anisotropy (D) of the HC and presurgical (presurg) groups. The DTI of the genu of the CC in the presurgical patients indicates a significantly higher E23 (P = .018), higher ADC (P = .026), and lower FA (P = .033). In the splenium of the CC, we measured significantly lower FA (P = .033) in the presurg groups compared with the HC.