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Unilateral meningoencephalitis with hemispheric slowing on EEG
H Takeuchi1, T Iguchi, T Ishikawa
1Department of Pediatrics, Nagoya City University Medical School, Japan.
Brain & Development
|January 1, 1997
Summary
A boy with non-herpes simplex virus meningoencephalitis had subtle right brain dysfunction. Electroencephalograms (EEGs) revealed prolonged slowing, guiding diagnosis despite normal neuroimaging.
Area of Science:
- Neurology
- Pediatric Neurology
- Neuroinfectious Diseases
Background:
- Meningoencephalitis, an inflammation of the brain and meninges, can present with diverse neurological symptoms.
- Non-herpes simplex virus (HSV) etiologies are less common but crucial to identify for appropriate management.
- Pediatric cases often require careful diagnostic evaluation due to potential for subtle presentations.
Observation:
- A 12-year-old male presented with seizures affecting left extremities and loss of consciousness.
- Initial neuroimaging studies, including MRI or CT, revealed normal findings.
- Interictal electroencephalograms (EEGs) demonstrated prolonged slowing predominantly in the right cerebral hemisphere.
Findings:
- The unilateral EEG abnormalities correlated with right-sided brain dysfunction identified through neuropsychological testing.
- This case highlights a non-HSV meningoencephalitis with focal neurological deficits.
- The findings underscore the utility of EEG in detecting subtle brain dysfunction when neuroimaging is unremarkable.
Implications:
- Electroencephalography (EEG) plays a critical role in diagnosing subtle encephalitis, especially when neuroimaging is normal.
- Early identification of lateralized brain dysfunction is essential for targeted treatment and prognosis.
- This case emphasizes the importance of considering non-HSV causes of meningoencephalitis in pediatric patients.