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Published on: September 20, 2024
Hippocampal MRI signal hyperintensity after febrile status epilepticus is predictive of subsequent mesial temporal
James M Provenzale1, Daniel P Barboriak, Kevan VanLandingham
1Department of Radiology, Duke University Medical Center, Box 3808, Durham, NC 27710, USA.
Objective:
The objective of our study was to test the hypothesis that the finding of hyperintense hippocampal signal intensity on T2-weighted MR images soon after febrile status epilepticus is associated with subsequent hippocampal volume loss and persistent abnormal signal intensity on T2-weighted images (i.e., mesial temporal sclerosis).
Subjects And Methods:
Eleven children (mean age, 25 months) underwent initial MRI that included coronal temporal lobe imaging within 72 hours of febrile status epilepticus and follow-up imaging from 3 to 23 months later (mean, 9 months). A neuroradiologist blinded to clinical history graded initial and follow-up hippocampal signal intensity on a scale from 0 (normal) to 4 (markedly increased). Two blinded observers measured hippocampal volumes on initial and follow-up MR studies using commercially available software and volumes from 30 healthy children (mean age, 6.3 years). Initial signal intensity and hippocampal volume changes were compared using Kendall tau correlation coefficients.
Results:
On initial imaging, hyperintense signal intensity ranging from 1 (minimally increased) to 4 (markedly increased) was seen in seven children. Four children had at least one hippocampus with moderate or marked signal abnormality, three children had a hippocampus with mild or minimal abnormality, and four children had normal signal intensity. The Kendall tau correlation coefficient between signal intensity increase and volume change was -0.68 (p < 0.01). Five children (two with temporal lobe epilepsy and two with complex partial seizures) had hippocampal volume loss and increased signal intensity on follow-up imaging, meeting the criteria for mesial temporal sclerosis.
Conclusion:
MRI findings of a markedly hyperintense hippocampus in children with febrile status epilepticus was highly associated with subsequent mesial temporal sclerosis.
Insights
Hyperintense hippocampal MRI signals in children after febrile status epilepticus predict mesial temporal sclerosis. This finding indicates potential for early diagnosis of this epilepsy condition.
Area of Science:
- Pediatric Neurology
- Neuroradiology
- Epilepsy Research
Background:
- Febrile status epilepticus (FSE) in children can lead to neurological complications.
- Mesial temporal sclerosis (MTS) is a common cause of epilepsy, often associated with hippocampal damage.
Purpose of the Study:
- To investigate if early T2-weighted MRI signal hyperintensity in the hippocampus after FSE predicts later hippocampal volume loss and MTS.
- To test the hypothesis linking acute MRI findings to chronic epilepsy pathology.
Main Methods:
- Eleven children with FSE underwent serial MRI scans (initial within 72 hours, follow-up at ~9 months).
- Hippocampal signal intensity was graded by a blinded neuroradiologist; volumes were measured by blinded observers.
- Correlation analysis (Kendall tau) compared initial signal intensity with subsequent volume changes.
Main Results:
- Seven of eleven children showed initial hippocampal T2 hyperintensity.
- A significant negative correlation (Kendall tau = -0.68, p < 0.01) was found between initial signal intensity and hippocampal volume change.
- Five children developed MTS, characterized by hippocampal volume loss and persistent signal abnormalities on follow-up MRI.
Conclusions:
- Markedly hyperintense hippocampal signals on initial MRI after FSE are strongly associated with the development of mesial temporal sclerosis.
- Early MRI findings can serve as a predictive marker for MTS in children post-FSE.
