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Nonvasculitic autoimmune inflammatory meningoencephalitis (NAIM): a reversible form of encephalopathy

R J Caselli1, B F Boeve, B W Scheithauer

  • 1Department of Neurology, Mayo Clinic Scottsdale, AZ 85259, USA.

Neurology
|October 26, 1999
PubMed

Insights

Steroid-responsive autoimmune meningoencephalitis can cause progressive cognitive decline, psychosis, and gait issues. Early diagnosis and treatment are crucial for managing this rare inflammatory brain condition.

Area of Science:

  • Neurology
  • Immunology
  • Neuroinflammation

Background:

  • Autoimmune meningoencephalitis is a group of rare inflammatory brain disorders.
  • These conditions can mimic neurodegenerative diseases, posing diagnostic challenges.

Observation:

  • Five patients (54-80 years) presented with progressive cognitive decline, psychosis, and unsteady gait.
  • Symptoms appeared 3 weeks to 18 months after onset.

Findings:

  • The condition was identified as steroid-responsive nonvasculitic autoimmune inflammatory meningoencephalitic syndrome.
  • Cerebrospinal fluid (CSF) analysis revealed elevated immunoglobulin G (IgG) index and IgG synthesis rate in tested patients.
  • Brain biopsy showed perivascular lymphocytic infiltrates without vessel wall invasion.

Implications:

  • This syndrome is treatable with immunosuppressive therapy, such as steroids.
  • Prompt diagnosis can prevent irreversible neurological damage.
  • Further research into specific triggers and long-term outcomes is warranted.

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