FIG 1. Concordance among MR imaging, MRS, and PET in right hippocampal sclerosis. Oblique coronal T2-weighted MR image (top row, middle) shows right hippocampal sclerosis (arrow), in concordance with PET scan (bottom row, middle), which shows decreased metabolism in right temporal lobe (arrow). The MR spectrum from the right hippocampus (Rt) shows marked decrease in NAA/Cho ratio (arrow). The MR spectrum from left hippocampus is normal (Lt)