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Febrile infection-related epilepsy syndrome with claustrum lesion: an underdiagnosed inflammatory encephalopathy

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Abstract

Objective

To summarize the clinical characteristics and prognosis of febrile infection-related epilepsy syndrome with claustrum lesions (FIRES-C).

Method

Clinical data of FIRES-C patients were collected retrospectively. The study reviewed and analyzed their clinical manifestations, treatment strategies, and prognosis.

Result

Twenty patients were enrolled, including 13 females and 7 males, with a median onset age of 20.5 years. All patients developed seizures after fever, with a median interval of 5 days. Brain MRI showed symmetric lesions in the claustrum in all patients. The median interval from seizure onset to abnormal MRI signals detection was 12.5 days. All patients had negative results for comprehensive tests of neurotropic viruses and antineuronal autoantibodies. Seventy percent of cases had been previously empirically diagnosed with autoimmune encephalitis or viral encephalitis before. All patients received anti-seizure medicine. Eleven patients (55%) received antiviral therapy. All patients received immunotherapy, including glucocorticoids (100%), intravenous immunoglobulin (IVIg) (65%), plasma exchange (PLEX) (10%), tocilizumab (10%), rituximab (5%), and cyclophosphamide (5%). Sixty percent of patients received long-term immunotherapy (≥ 3 months). The median follow-up was 11.5 months;60% of patients were diagnosed with refractory epilepsy.

Conclusion

Bilateral claustrum lesion on MRI is a distinctive neuroimage feature for FIRES, which may serve as an indication for the initial clinical assessments. FIRES-C should be classified as a type of inflammatory encephalopathy characterized by a monophasic nature. Some FIRES-C patients respond to immunotherapy and antiseizure treatments but most experience refractory epilepsy as a long-term outcome.

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Data availability

Data available on request from the authors.

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Funding

This study was funded by the National High-Level Hospital Clinical Research Funding (grant no. 2022-PUMCH-B-120) and the CAMS Innovation Fund for Medical Sciences (grant no. CIFMS: 2021-I2M-1–003).

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Authors

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Contributions

Lin Bai: drafting the paper, design of the work, contributions to the acquisition, and analysis of data for the work. Weiying Di, Zucai Xu, Bin Liu, Nan Lin, Siyuan Fan, Haitao Ren, Qiang Lu, and Jiawei Wang: collecting the data, design of the work, and reviewing. Hongzhi Guan: design of the work, contributions to the interpretation of data for the work, and reviewing.

Corresponding author

Correspondence to Hongzhi Guan.

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Ethical approval

This retrospective study included cases registered in the Encephalitis and Paraneoplastic Syndrome Project and received approval from the Ethics Committee of PUMCH (approval no. JS-891). Written informed consent was obtained from all patients.

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Bai, L., Di, W., Xu, Z. et al. Febrile infection-related epilepsy syndrome with claustrum lesion: an underdiagnosed inflammatory encephalopathy. Neurol Sci 45, 3411–3419 (2024). https://doi.org/10.1007/s10072-024-07363-5

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  • DOI: https://doi.org/10.1007/s10072-024-07363-5

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