RT Journal Article SR Electronic T1 Infectious encephalitis: mimics and chameleons JF Practical Neurology JO Pract Neurol FD BMJ Publishing Group Ltd SP 225 OP 237 DO 10.1136/practneurol-2018-002114 VO 19 IS 3 A1 Michel Toledano A1 Nicholas W S Davies YR 2019 UL http://pn.bmj.com/content/19/3/225.abstract AB ‘Query encephalitis’ is a common neurological consultation in hospitalised patients. Identifying the syndrome is only part of the puzzle. Although historically encephalitis has been almost synonymous with infection, we increasingly recognise parainfectious or postinfectious as well as other immune-mediated causes. We must also distinguish encephalitis from other causes of encephalopathy, including systemic infection, metabolic derangements, toxins, inherited metabolic disorders, hypoxia, trauma and vasculopathies. Here, we review the most important differential diagnoses (mimics) of patients presenting with an encephalitic syndrome and highlight some unusual presentations (chameleons) of infectious encephalitis.