Functional and structural brain changes in anti-N-methyl-D-aspartate receptor encephalitis

Area of Science:

• Neuroscience
• Immunology
• Radiology

Background:

• Anti-N-methyl-D-aspartate receptor (NMDAR) encephalitis presents with severe neuropsychiatric symptoms.
• Standard MRI often shows normal findings despite prolonged illness.

Purpose of the Study:

• Investigate structural and functional brain changes in anti-NMDAR encephalitis patients.
• Correlate imaging findings with clinical presentation and disease severity.

Main Methods:

• Multimodal MRI (structural, functional connectivity, diffusion tensor imaging, voxel-based morphometry) and neuropsychological testing.
• Compared 24 anti-NMDAR encephalitis patients with age- and gender-matched controls.

Main Results:

• Reduced hippocampal functional connectivity with the default mode network observed.
• White matter integrity changes, particularly in the cingulum, correlated with disease severity.
• No differences in structural imaging or gray matter morphology between patients and controls.

Conclusions:

• Anti-NMDAR encephalitis is linked to distinct functional connectivity and white matter alterations.
• These neuroimaging findings help explain the clinicoradiological paradox and disease pathophysiology.
• Abnormalities correlate with symptoms, indicating their role in disease manifestation.