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PET follow-up in a case of anti-NMDAR encephalitis: arguments for cingulate limbic encephalitis

Jean-Baptiste Chanson1, Mihaela Diaconu, Jérôme Honnorat

  • 1Département de Neurologie, CHRU de Strasbourg, France. jean-baptiste.chanson@chrustrasbourg.fr

Epileptic Disorders : International Epilepsy Journal with Videotape
|March 20, 2012
PubMed
Abstract

Insights

This study highlights how functional neuroimaging, specifically 18-fluorodeoxyglucose PET, can detect brain changes in anti-NMDA receptor encephalitis, even when MRI is normal. The findings suggest the anterior cingulate cortex is crucial for psychiatric symptoms in this condition.

Area of Science:

  • Neuroscience
  • Neurology
  • Immunology

Background:

  • Anti-NMDA receptor encephalitis often presents with non-specific MRI findings, complicating the localization of affected brain regions.
  • Functional neuroimaging offers a potential method to identify brain dysfunction linked to psychiatric manifestations in this condition.
  • Limited precise data currently exists on the utility of functional neuroimaging in anti-NMDA receptor encephalitis.

Observation:

  • A case study involving a 27-year-old woman with behavioral changes and seizures.
  • Diagnosis of anti-NMDA receptor encephalitis confirmed by CSF analysis.
  • 18-fluorodeoxyglucose PET revealed hypermetabolism in the left prefrontal cortex and anterior cingulate cortex, which resolved post-treatment.
  • Brain MRI showed only a mild left prefrontal hypersignal.

Findings:

  • Hypermetabolic foci in the left prefrontal cortex and anterior cingulate cortex were identified using 18-fluorodeoxyglucose PET.
  • These hypermetabolic areas normalized after treatment, correlating with symptom improvement.
  • Increased marker uptake in motor and premotor regions likely reflects epileptic activity.

Implications:

  • The anterior cingulate cortex may play a significant role in the psychiatric symptoms associated with anti-NMDA receptor encephalitis.
  • Functional neuroimaging, particularly PET, can be valuable for assessing brain dysfunction in anti-NMDA receptor encephalitis.
  • Further research is necessary to elucidate the pathophysiology of anti-NMDA receptor encephalitis and the role of specific brain regions.

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