Claustrum hyperintensities: A potential clue to autoimmune epilepsy.

Area of Science:

• Neurology
• Neuroimmunology
• Neuroradiology

Background:

• Autoimmune limbic encephalitis and epilepsy are challenging neurological conditions.
• Identifying specific biomarkers for autoimmune epilepsy is crucial for timely diagnosis and treatment.

Purpose of the Study:

• To investigate the significance of claustrum fluid-attenuated inversion recovery (FLAIR) hyperintensities in patients with autoimmune limbic encephalitis and/or epilepsy.
• To determine if claustrum FLAIR hyperintensities can serve as a diagnostic marker for autoimmune epilepsy.

Main Methods:

• Retrospective analysis of a cohort of 34 patients with autoimmune limbic encephalitis and/or epilepsy.
• Detailed review of magnetic resonance imaging (MRI) findings, particularly FLAIR sequences, focusing on the claustrum.
• Correlation of MRI findings with clinical presentation, cerebrospinal fluid (CSF) analysis, electroencephalogram (EEG), and response to immunotherapy.

Main Results:

• Four out of 34 patients exhibited claustrum FLAIR hyperintensities.
• These patients presented with explosive onset seizures, medically intractable epilepsy, cognitive/behavioral disturbances, and some had CSF lymphocytic pleocytosis and neural autoantibodies.
• Claustrum FLAIR hyperintensities were associated with frontal/parasagittal EEG abnormalities and, in one case, magnetoencephalography (MEG) findings mirroring the FLAIR abnormalities.

Conclusions:

• Claustrum FLAIR hyperintensities represent a potential imaging biomarker in autoimmune epilepsy.
• This finding may aid in the diagnosis and understanding of autoimmune-mediated neurological dysfunction affecting the claustrum.