YWHAQ and viral encephalitis: Multiple causes of encephalitis were ruled out given no evidence of infection at any time, normal CT and MRI brain and negative CSF results for infectious, inflammatory, autoimmune (anti-NMDA), paraneoplastic (paraneoplastic antibodies) or neurodegenerative (CSF Tau protein, 14-3-3- protein, end-point quaking-induced conversion time was negative) causes.