Cortical Hyperintensity on Diffusion-weighted Images as the Presymptomatic Marker of Sporadic Creutzfeldt-Jakob Disease.

We herein report a sporadic Creutzfeldt-Jakob disease (sCJD) patient followed from the presymptomatic phase to death. A 67-year-old woman had abnormal hyperintense cortical lesions on diffusion-weighted magnetic resonance imaging (MRI) one year before the onset. The levels of 14-3-3 protein and total tau protein, and findings from a real-time quaking-induced conversion test were normal at first but became abnormal after disease onset. Although there are four reports of presymptomatic sCJD identified by MRI, this is the first case report in which all three biomarkers had been assessed before and after the disease onset. MRI might be the most sensitive modality for detecting presymptomatic sCJD patients.