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Chapter 1 - Importance, Definitions, History, Classification, and Frequency of the Autoimmune Encephalitides

from Section 1 - Overview

Published online by Cambridge University Press:  27 January 2022

Josep Dalmau  and
Francesc Graus
Josep Dalmau
Affiliation:
Universitat de Barcelona
Francesc Graus
Affiliation:
Universitat de Barcelona
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Summary

About 20 years ago the group of diseases currently known as ‘autoimmune encephalitis’ or ‘antibody-mediated encephalitis’ was unknown and the entire field of ‘autoimmune neurology’ non-existent. Since then, 18 autoimmune encephalitis and the corresponding syndromes have been described, including 16 in which the antigens are expressed on the cell surface of neurons and two on the surface of glial cells. The characterization of these autoimmune encephalitis was facilitated by the cumulative knowledge provided by research on autoimmune disorders of the neuromuscular junction (myasthenia gravis and Lambert–Eaton myasthenic syndrome) and the paraneoplastic neurological syndromes. Up to 12.6 per 100,000 persons are affected by encephalitis annually. Of these, it has been estimated that 20–30% are caused by autoimmune mechanisms. In children the most frequent types of autoimmune encephalitis are acute disseminated encephalomyelitis (ADEM), anti-MOG, and anti-NMDAR encephalitis. In young adults, particularly women, anti-NMDAR encephalitis, and in late adulthood, anti-LGI1 encephalitis, are the most prevalent autoimmune encephalitis. The most frequently used classifications combine information related to three features: mechanisms of disease (cytotoxic T cell or antibody-mediated mechanisms), type of antigen (intracellular vs cell surface), and presence or absence of a tumour. The detection of a neoplasm frequently serves to categorize the autoimmune encephalitis as paraneoplastic.

Keywords

Autoimmune encephalitisNMDAR antibodiesantibodies against synaptic receptorsonconeural antibodieslimbic encephalitisparaneoplastic neurological syndromes
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Autoimmune Encephalitis and Related Disorders of the Nervous System , pp. 1 - 18
Publisher: Cambridge University Press
Print publication year: 2022

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