Neuropsychological implication in possible antibody-negative limbic encephalitis: a clinical case report

Area of Science:

• Neurology
• Immunology
• Neuropsychology

Background:

• Autoimmune limbic encephalitis is an inflammatory brain condition mediated by antibodies, typically affecting the medial temporal lobe.
• Diagnosis often relies on identifying antineuronal antibodies, but antibody-negative cases pose diagnostic difficulties, necessitating exclusion of other causes.

Observation:

• A 28-year-old male presented with symptoms consistent with limbic encephalitis, including bilateral medial temporal lobe and hippocampal hyperintensities on MRI.
• Despite negative serology for neurotropic viruses and antibody-mediated encephalitis, the patient exhibited significant neuropsychological deficits.
• Key deficits included impaired emotional face recognition and severe autobiographical amnesia.

Findings:

• The case demonstrates that antibody-negative limbic encephalitis can manifest with extensive memory impairments, particularly affecting autobiographical recall.
• Radiological findings of bilateral medial temporal lobe and amygdala damage correlate with the observed memory deficits.
• This case expands the recognized clinical spectrum of antibody-negative encephalitis.

Implications:

• The findings suggest that antibody-negative limbic encephalitis may involve broader memory impairments than previously understood.
• This case underscores the importance of considering limbic encephalitis even in the absence of detectable antibodies.
• Further research is needed to elucidate the mechanisms and full clinical spectrum of antibody-negative encephalitis.