RT Journal Article SR Electronic T1 Mild encephalitis with reversible splenial (MERS) lesion syndrome due to influenza B virus JF Practical Neurology JO Pract Neurol FD BMJ Publishing Group Ltd SP 391 OP 392 DO 10.1136/practneurol-2018-001880 VO 18 IS 5 A1 Vanderschueren, Geraldine A1 Schotsmans, Katlijn A1 Maréchal, Emke A1 Crols, Roeland YR 2018 UL http://pn.bmj.com/content/18/5/391.abstract AB We describe a 16-year-old boy with mild encephalitis with reversible lesions in the white matter and splenium of corpus callosum as a complication of an influenza B virus infection. Although more common in Asiatic children, it can also occur in Caucasian children and adults. There are several possible causes, including metabolic disorders, hypertension and infection, and the prognosis is usually good, even without treatment.