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Herpes simplex virus encephalitis during childhood: importance of brain biopsy diagnosis
Insights
Differentiating herpes simplex virus (HSV) encephalitis in children is challenging. Early brain biopsy and antiviral therapy are crucial for improving outcomes in suspected cases.
Area of Science:
- Pediatric Neurology
- Infectious Diseases
- Neuroimaging
Background:
- Herpes simplex virus (HSV) encephalitis is a severe neurological condition in children.
- Accurate and timely diagnosis is critical for effective treatment and improved patient outcomes.
- Distinguishing HSV encephalitis from other encephalitic syndromes can be difficult using standard clinical and noninvasive methods.
Purpose of the Study:
- To evaluate the diagnostic utility of brain biopsy in pediatric patients with suspected HSV encephalitis.
- To compare the effectiveness of EEG and CT scans in identifying focal lesions in early HSV encephalitis.
- To assess the outcomes of HSV encephalitis and identify strategies to prevent poor prognoses.
Main Methods:
- Retrospective analysis of twelve pediatric patients (1 day to 11 years) with suspected HSV encephalitis who underwent brain biopsy.
- Comparison of epidemiological, clinical, and laboratory data between patients with confirmed HSV encephalitis and those with other conditions.
- Evaluation of electroencephalography (EEG) and computed tomography (CT) scan findings for lesion detection.
Main Results:
- Five patients had confirmed HSV encephalitis; seven had other conditions (subdural empyema, glioma, enteroviral encephalitis, non-HSV viral encephalitis).
- Epidemiologic, clinical, and noninvasive tests failed to differentiate between HSV encephalitis and other diagnoses.
- EEG demonstrated higher sensitivity than CT scans in detecting focal lesions in early HSV encephalitis.
- The mean time to antiviral chemotherapy in HSV encephalitis patients was 3 days, with uniformly poor outcomes.
Conclusions:
- Brain biopsy is essential for definitive diagnosis in pediatric patients with suspected HSV encephalitis.
- Early diagnosis and initiation of antiviral chemotherapy, alongside brain biopsy, are vital to prevent poor outcomes and exclude treatable mimics.
- EEG may be more sensitive than CT in the early detection of focal lesions in HSV encephalitis.
Abstract:
Twelve consecutive pediatric patients 1 day to 11 years of age with suspected herpes simplex virus (HSV) encephalitis underwent brain biopsy. Five were proved to have HSV encephalitis; seven had subdural empyema, malignant glioma, enteroviral encephalitis, (one each), and presumed viral encephalitis, non-HSV (four). Neither epidemiologic, clinical, nor noninvasive laboratory tests were able to help differentiate the two groups of patients. The EEG was more sensitive than the CT scan in demonstrating focal lesions in early HSV encephalitis. In patients with HSV encephalitis, the mean time from hospital admission to appropriate antiviral chemotherapy was 3 days, and the outcome of HSV encephalitis was uniformly poor. In patients with febrile encephalitis-like syndromes with CSF pleocytosis, focal neurologic signs, or other localizing test results (EEG, CT), anticipatory antiviral chemotherapy and brain biopsy are the only hope to prevent the poor outcome associated with HSV encephalitis, to exclude other treatable conditions, and to avoid multiple types of unnecessary empiric therapies.