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[Proton MR spectroscopy findings in herpes simplex encephalitis]
M Hitosugi1, M Ichijo, Y Matsuoka
1Department of Internal Medicine, Kawasaki Municipal Hospital.
Rinsho Shinkeigaku = Clinical Neurology
|July 1, 1996
Summary
Proton magnetic resonance spectroscopy (1H-MRS) can detect neural loss and gliosis in herpes simplex virus encephalitis (HSE) patients. This technique reveals specific histological changes even in unaffected brain areas, aiding HSE diagnosis.
Area of Science:
- Neurology
- Radiology
- Biochemistry
Background:
- Herpes simplex virus type I encephalitis (HSE) is a severe neurological condition.
- Accurate diagnosis and assessment of brain involvement are crucial for effective treatment.
Observation:
- Localized proton magnetic resonance spectroscopy (1H-MRS) was performed on two HSE patients.
- MR spectra of temporal lobes were analyzed using a 1.5T unit, focusing on N-acetyl aspartate (NAA), choline (Cho), and creatine (Cr) levels.
Findings:
- Reduced NAA/Cr ratio observed in both affected and contralateral temporal lobes, indicating neural loss and gliosis.
- Elevated Cho/Cr ratio detected bilaterally, more pronounced in affected areas, suggesting ongoing cellular processes.
- 1H-MRS identified specific metabolic changes characteristic of HSE, even in regions with normal MRI appearance.
Implications:
- 1H-MRS is a valuable tool for detecting and characterizing histological changes in HSE.
- This technique can reveal subclinical brain involvement, aiding in early diagnosis and management of HSE.
- Findings suggest 1H-MRS can differentiate HSE from other neurological conditions by showing specific metabolic profiles.