Fig 1.

Case 19. A, Axial volumetric T1-weighted image demonstrates thickening of the cortex in the left frontal gyrus (arrow), associated with blurring of gray-white matter, in keeping with FCD. Regions with abnormal FA (B), MD (C), λ1 (D), λ₂ (E), and λ₃ (orange areas) (F) and MEG dipoles (white) are overlaid onto volumetric T1-weighted image. The MEG dipole cluster, corresponding to the epileptogenic zone, is localized to the left frontal lobe and a few scattered dipoles in the right frontal lobe. There is lobar concordance of abnormal FA, MD, and eigenvalues with the MEG dipole cluster. There are bilateral abnormal λ₂s, most of which are localized to the left frontal lobe. There is also overlap among the x-, y-, and z-axes distributions of abnormal FA, MD, and 3 eigenvalues with the MEG dipole cluster.