Autoimmune Encephalitides and Rapidly Progressive Dementias

Area of Science:

• Neurology
• Immunology

Background:

• Rapidly progressive dementia (RPD) presents a diagnostic challenge in neurology.
• While primary dementias are common, reversible causes, including autoimmune encephalitis (AE), must be considered.
• AE is an emerging differential diagnosis for RPD.

Purpose of the Study:

• To highlight autoimmune encephalitis (AE) in the differential diagnosis of rapidly progressive dementia (RPD).
• To emphasize the importance of identifying potential autoimmune causes for RPD.
• To guide clinicians on initial diagnostic steps for AE in RPD cases.

Main Methods:

• Review of clinical history and examination findings suggestive of AE.
• Discussion of ancillary testing including autoantibody panels in serum and cerebrospinal fluid.
• Consideration of neuroimaging and electroencephalography (EEG) in the diagnostic work-up.

Main Results:

• Clinical clues from history and examination are vital for suspecting AE in RPD.
• Early ancillary testing, including autoantibody detection, is recommended for suspected AE.
• Multi-modal investigations (serum/CSF autoantibodies, imaging, EEG) are the first line for AE diagnosis.

Conclusions:

• Autoimmune encephalitis (AE) represents a treatable cause of rapidly progressive dementia (RPD).
• Systematic evaluation for AE should be integrated into the RPD work-up.
• Timely diagnosis and subtype-specific treatment are essential for favorable patient outcomes.