LGI1 and generalized anxiety disorder: FDG PET and brain MRI were in disagreement in the remaining 11/25 patients (44%): (i) 9/11 had abnormal PET without MR abnormalities (4 with MTL hypermetabolism, including 2 LGI1 and 2 NMDAR patients), and (ii) 3/11 patients had MTL FLAIR hyperintensity without FDG PET abnormalities (2 chronic GAD patients at 48 and 72 months of follow-up, with mild MRI abnormalities, and 1 LGI1 patient at 4 months of follow-up with PET abnormalities in other regions than the MTL).