Plots of age-adjusted FA and MD from entorhinal WM and the estimated or actual proximity to symptom onset. In the horizontal axis, 0 indicates the estimated age of symptom onset for asymptomatic MAPT mutation carriers based on the median age at the symptom onset in symptomatic MAPT mutation carriers from the same family. 0 indicates the age at actual symptom onset in symptomatic MAPT mutation carriers. Abbreviations: FA, fractional anisotropy; MD, mean diffusivity; MAPT, microtubule-associated protein tau; WM, white matter.