Flavivirus encephalitis

Last revised by Rohit Sharma on 20 Dec 2023

Flavivirus encephalitis (plural: encephalitides) includes a number of entities which characteristically involve the basal ganglia and thalami

Typically these conditions present with a prodrome which is non-specific but highly suggestive of a viral infection. Symptoms include fever, myalgia, rash, rigors and/or headache. Eventually, CNS symptoms develop, including dystonia, dyskinesia, tremor, drooling, dysarthria and/or seizures 1.

There are over 70 flaviviruses. The most important include 1-3:

MRI is the modality of choice to evaluate all types of encephalitis.

Although the pattern of involvement varies from agent to agent, in general, sites of involvement include 1:

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