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Diffusion-weighted magnetic resonance imaging in nonconvulsive status epilepticus
1Department of Neurology, Seoul National University Hospital, Clinical Research Institute, Neuroscience Research Institute, Seoul National University Medical Research Institute, 28, Yongon-dong, Seoul 110-744, South Korea.
Archives of Neurology
|June 19, 2001
Summary
Diffusion-weighted imaging revealed diffuse neuronal injury in a patient with nonconvulsive status epilepticus (SE). This technique can help localize seizure foci and predict prognosis in SE cases.
Area of Science:
- Neuroimaging
- Epileptology
- Neuroradiology
Background:
- Status epilepticus (SE) can cause cytotoxic edema due to excitotoxicity, affecting apparent diffusion coefficients on DWI.
- Previous human studies primarily reported focal DWI abnormalities in partial SE.
Observation:
- A 56-year-old male presented with altered consciousness, diagnosed with nonconvulsive SE.
- EEG showed continuous bifrontal sharp waves; treatment included phenytoin and midazolam.
- DWI was performed during SE and at 5-month follow-up.
Findings:
- Initial DWI showed diffuse cortical hyperintensity and decreased apparent diffusion coefficients, particularly in occipital lobes.
- T2-weighted imaging revealed cortical swelling without brainstem, basal ganglia, thalamus, or white matter involvement.
- Follow-up DWI demonstrated marked atrophy and increased apparent diffusion coefficients in affected areas.
Implications:
- DWI findings suggest diffuse cytotoxic edema from neuronal excitotoxicity in prolonged nonconvulsive SE.
- DWI aids in localizing seizure foci, predicting tissue prognosis, and understanding SE pathophysiology.