Question 880
{"accessible":false,"alternatives":[{"id":4425,"text":"T2/FLAIR hyperintensity of the basal ganglia and/or thalami"},{"id":4426,"text":"T2/FLAIR hyperintensity of the brainstem"},{"id":4427,"text":"T2/FLAIR hyperintensity of the centrum semiovale"},{"id":4428,"text":"T2/FLAIR hyperintensity of the insular cortex"},{"id":4429,"text":"T2/FLAIR hyperintensity of the mesial temporal lobes"}],"archived":false,"correctAlternativeId":4425,"explanation":"\u003cp\u003e\u003ca href=\"/articles/flavivirus-encephalitis\"\u003eFlavivirus encephalitis\u003c/a\u003e\u0026nbsp;is an umbrella term for a number of viral encephalitides such as \u003ca href=\"/articles/japanese-encephalitis\"\u003eJapanese encephalitis\u003c/a\u003e,\u0026nbsp;\u003ca href=\"https://radiopaedia.org/articles/murray-valley-encephalitis\"\u003eMurray Valley encephalitis\u003c/a\u003e,\u0026nbsp;St Louis encephalitis, and West Nile encephalitis.\u0026nbsp;Although the pattern of MRI involvement varies from agent to agent, in general, there is marked T2/FLAIR hyperintensity in the \u003ca href=\"https://radiopaedia.org/articles/basal-ganglia\"\u003ebasal ganglia\u003c/a\u003e\u0026nbsp;and/or\u0026nbsp;\u003ca href=\"https://radiopaedia.org/articles/thalamus\"\u003ethalami\u003c/a\u003e bilaterally. Of the remaining options, the brainstem is next most\u0026nbsp;commonly involved, particularly in \u003ca href=\"/articles/murray-valley-encephalitis\"\u003eMurray Valley encephalitis\u003c/a\u003e. These regions of T2 hyperintensity may or may not have accompanying high diffusion signal on DWI. Furthermore, evidence of hemorrhage may also be evident in these lesions, particularly in \u003ca href=\"/articles/japanese-encephalitis\"\u003eJapanese encephalitis\u003c/a\u003e.\u003c/p\u003e","id":880,"imageUrl":null,"imageAttribution":null,"imageAttributionCaseInfo":null,"firstQuestionPath":"/questions/880","nextQuestionPath":null,"relatedArticles":[{"id":32477,"title":"Japanese encephalitis","link":"/articles/japanese-encephalitis?lang=us"},{"id":13100,"title":"Flavivirus encephalitis","link":"/articles/flavivirus-encephalitis?lang=us"},{"id":35564,"title":"CNS infectious diseases","link":"/articles/cns-infectious-diseases?lang=us"}],"alsoUsedIn":[],"stem":"\u003cp\u003eWhat is the most common MRI finding in flavivirus encephalitides such as Japanese encephalitis or Murray Valley encephalitis?\u003c/p\u003e","menuLinks":[{"text":"Report problem with question","url":"https://docs.google.com/forms/d/e/1FAIpQLSfO3soWYhOjJ7yErSysyCe5V4A1CqW7WK3rDA7MtAkecMGqNw/viewform?entry.1624461248\u0026entry.553583435=https://radiopaedia.org/questions/880"}],"attemptsPercentages":[{"alternativeId":"4427","percentage":5},{"alternativeId":"4425","percentage":75},{"alternativeId":"4426","percentage":6},{"alternativeId":"4429","percentage":9},{"alternativeId":"4428","percentage":5}],"promptToLogin":false,"questionManager":false,"articleId":"murray-valley-encephalitis"}