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Related Experiment Video

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Anti-LGI1 encephalitis: clinical presentation, imaging features, and prognostic analysis.

Xin Chen1,2, Qiuyan Liu1, Xiaojuan Wang2

  • 1Henan Medical University, Henan Provincial People's Hospital, Zhengzhou, China.

Frontiers in Neurology
|December 31, 2025
PubMed
Summary

Anti-leucine-rich glioma-inactivated 1 (LGI1) antibody associated encephalitis presents with diverse neurological symptoms and often hyponatremia. Immunotherapy is highly effective, leading to favorable outcomes in most patients.

Keywords:
anti-leucine-rich glioma-inactivated 1 antibodyautoimmune encephalitisencephalitisimmunotherapyprognosis

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Area of Science:

  • Neurology
  • Immunology
  • Neuroscience

Background:

  • Anti-leucine-rich glioma-inactivated 1 (LGI1) antibody associated encephalitis is an immune-mediated disorder.
  • Understanding its clinical spectrum and neuroimaging is crucial for diagnosis and management.

Purpose of the Study:

  • To investigate the clinical features, neuroimaging characteristics, and prognosis of patients with anti-LGI1 antibody associated encephalitis.
  • To analyze the effectiveness of immunotherapy in these patients.

Main Methods:

  • Retrospective study of 87 patients diagnosed with anti-LGI1 encephalitis.
  • Systematic analysis of clinical data, neuroimaging findings, and follow-up outcomes.
  • Inclusion of cerebrospinal fluid (CSF) analysis, thyroid function tests, and electrocardiography.

Main Results:

  • Common symptoms include memory impairment, seizures (especially faciobrachial dystonic seizures - FBDS), psychiatric disturbances, and autonomic dysfunction.
  • High prevalence of hyponatremia (50.0%) and hyperhomocysteinemia (28.7%).
  • MRI abnormalities common (93.8%), particularly in the temporal lobe and hippocampus. Immunotherapy led to favorable outcomes in 93.7% of patients with follow-up data.

Conclusions:

  • Anti-LGI1 encephalitis is characterized by a distinct set of neurological and systemic manifestations.
  • Early diagnosis and immunotherapy are associated with a good prognosis.
  • Hyponatremia and hyperhomocysteinemia are frequent comorbidities.