PNMA2 and viral encephalitis: MRI demonstrates abnormalities in up to 74% of patients with anti-Ma2 encephalitis including variable FLAIR hyperintense lesions of the diencephalon (thalamus/hypothalamus,) brainstem (midbrain, periaqueductal, pons, medulla oblongata, cerebellar peduncles), and limbic system (hippocampi) [44].