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MR findings in Murray Valley encephalitis.
Lloyd Einsiedel1, Evelyn Kat, Janakan Ravindran
1Department of Microbiology and Infectious Diseases, Flinders Medical Centre, Adelaide, Australia.
AJNR. American Journal of Neuroradiology
|August 15, 2003
Summary
Murray Valley encephalitis (MVE), a serious flavivirus infection, can cause severe neurological issues like quadriplegia. Specific MRI findings, particularly thalamic hyperintensity, can suggest MVE before serologic confirmation.
Area of Science:
- Neurovirology
- Medical Imaging
- Infectious Diseases
Background:
- Murray Valley encephalitis (MVE) is a mosquito-borne flavivirus infection endemic to Australia and Papua New Guinea.
- MVE virus is antigenically related to other significant neurotropic flaviviruses, including West Nile virus and Japanese encephalitis virus.
- Severe MVE cases can lead to significant neurological deficits and mortality.
Observation:
- A case of MVE is presented with severe neurological manifestations, including quadriplegia and respiratory failure.
- Magnetic resonance (MR) imaging revealed characteristic abnormalities.
- Specific brain regions and the cervical spinal cord showed T2-weighted hyperintensity.
Findings:
- MR imaging demonstrated thalamic hyperintensity on T2-weighted images.
- Additional findings included involvement of the red nucleus, substantia nigra, and cervical cord.
- These imaging findings were observed prior to serological confirmation of MVE.
Implications:
- Thalamic T2 hyperintensity on MR imaging is a potential imaging biomarker for flavivirus encephalitis.
- Early recognition of characteristic imaging patterns can aid in the diagnosis of MVE.
- Understanding these neuroimaging findings contributes to the differential diagnosis of encephalitis with similar clinical presentations.