[Novel Autoantibody-Related Encephalitis: anti-mGluR1 encephalitis, anti-IgLON5 disease, autoimmune GFAP astrocytopathy].

Various neurological syndromes are associated with autoimmune encephalitis. Anti-mGluR1 antibody encephalitis presents mainly as subacute cerebellar ataxia, while behavioral changes and involuntary movements also occur. Anti-IgLON5 disease presents mainly as a sleep disorder. It is sometimes difficult to distinguish these diseases from other neurodegenerative diseases. Autoimmune glial fibrillary acidic protein (GFAP) astrocytopathy is seen in meningoencephalomyelitis of unknown origin. Because these new autoimmune encephalitis diseases might be treatable, early diagnosis and treatment are necessary and important to improving the condition of patients with these diseases.