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Published on: December 20, 2024
Local glucose metabolism is unaltered in reversible splenial lesion syndrome
Johann Philipp Zöllner1,2, Jennifer Wichert3, Susanne Schubert-Bast2,4
1Department of Neurology and Epilepsy Center Frankfurt Rhine-Main, Goethe University Frankfurt, Frankfurt am Main, Germany.
Background And Purpose:
Transient splenial oedema, also known as reversible splenial lesion syndrome (RESLES), is a rare magnetic resonance imaging (MRI) finding that presents as a round or ovoid focal oedema in the posterior corpus callosum, and is associated with a wide range of clinical conditions. The aetiology of RESLES is not fully clear. We aimed to investigate conflicting pathophysiological hypotheses by measuring local glucose metabolism in patients with RESLES.
Methods:
We retrospectively analysed patients with RESLES after reductions in antiseizure medications during in-hospital video electroencephalography monitoring. We measured local glucose uptake using positron emission tomography/computed tomography and compared matched cohorts of patients with and without MRI evidence of RESLES using nonparametric tests.
Results:
Local glucose metabolism in the splenium of seven patients with RESLES was not significantly different from the glucose metabolism of the seven patients in the matched cohort. This was true using both regular and normalized standardized glucose uptake value calculation methods (p = 0.902 and p = 0.535, respectively).
Conclusion:
We found no evidence of local glucose hypometabolism in RESLES, which supports previous pathophysiological considerations that suggest that RESLES is an intercellular, intramyelinic oedema rather than a typical intracellular cytotoxic oedema, which is not reversible.
Insights
Reversible splenial lesion syndrome (RESLES) involves swelling in the brain
Area of Science:
- Neurology
- Radiology
- Neuroimaging
Background:
- Transient splenial oedema, or reversible splenial lesion syndrome (RESLES), is a rare MRI finding.
- RESLES presents as focal oedema in the posterior corpus callosum and is linked to various clinical conditions.
- The exact cause of RESLES remains unclear.
Purpose of the Study:
- To investigate conflicting pathophysiological hypotheses of RESLES.
- To measure local glucose metabolism in patients diagnosed with RESLES.
Main Methods:
- Retrospective analysis of RESLES patients undergoing EEG monitoring after antiseizure medication reduction.
- Measurement of local glucose uptake using PET/CT scans.
- Comparison of matched cohorts with and without RESLES using non-parametric tests.
Main Results:
- No significant difference in local glucose metabolism was observed in the splenium of RESLES patients compared to controls.
- This finding held true for both regular and normalized glucose uptake value calculations.
- Statistical analysis showed no significant difference (p = 0.902 and p = 0.535).
Conclusions:
- The study found no evidence of local glucose hypometabolism in RESLES.
- This supports the hypothesis that RESLES represents intercellular, intramyelinic oedema.
- This type of oedema is distinct from typical, irreversible intracellular cytotoxic oedema.
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