Autoimmune movement disorders.

Area of Science:

• Neurology
• Immunology

Background:

• Autoimmune movement disorders encompass a broad spectrum of neurological conditions.
• These disorders can manifest as isolated symptoms or alongside autoimmune encephalitis.
• Presentations often mimic neurodegenerative diseases like Huntington's in adults.

Purpose of the Study:

• To describe the various types of autoimmune movement disorders.
• To detail associated clinical features and autoantibodies.
• To discuss treatment strategies for these conditions.

Main Methods:

• Review of clinical presentations of autoimmune movement disorders.
• Identification of associated autoantibody targets (e.g., LGI1, glycine receptors, GAD65, PCA-1).
• Distinguishing between paraneoplastic and non-paraneoplastic causes.

Main Results:

• Movement disorders can be ataxic, hypokinetic (parkinsonism), or hyperkinetic (myoclonus, chorea, tics).
• Specific antibodies (e.g., GAD65) suggest non-paraneoplastic causes and potential for immunotherapy response.
• Other antibodies (e.g., PCA-1) may indicate paraneoplastic syndromes requiring cancer investigation.

Conclusions:

• Stiff-person syndrome and PERM are always autoimmune movement disorders.
• Understanding antibody targets is crucial for diagnosis and guiding treatment, including immunotherapy.
• Early immunotherapy can improve outcomes, particularly in GAD65-associated autoimmune movement disorders.