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Updated: Jun 3, 2025
Induction and Clinical Scoring of Chronic-Relapsing Experimental Autoimmune Encephalomyelitis
Published on: July 4, 2007
Diagnostic utility of magnetic resonance imaging in autoimmune encephalitis: prognostic implications
Poornima Narayanan Nambiar1, K Y Manisha1, Jayakumari Nandana1
1R Madhavan Nayar Center for Comprehensive Epilepsy Care, Department of Neurology, Sree Chitra Tirunal Institute for Medical Sciences and Technology, Thiruvananthapuram, Kerala, India.
Abstract:
BackgroundThe role of imaging in autoimmune encephalitis (AIE) remains unclear, and there are limited data on the utility of magnetic resonance imaging (MRI) to diagnose, treat, or prognosticate AIE.PurposeTo evaluate whether MRI is a diagnostic and prognostic marker for AIE and assess its efficacy in distinguishing between various AIE subtypes.Material and MethodsWe analyzed data from 96 AIE patients from our prospective autoimmune registry. MRI sequences examined were FLAIR, diffusion, SWI, T2WI, ASL, and contrast enhancement. Short-term outcomes were measured using the Modified Rankin Scale (mRS) at discharge; long-term outcomes were assessed with the Functional Independence Measure (FIM) at 6 months.ResultsMRI confirmed AIE in cases of new-onset seizures (82.1%, P < 0.001) and dementia (100%, P = 0.02). Antibody-negative AIE exhibited significant multifocal FLAIR abnormalities compared to antibody-positive cases (P = 0.002). LGI1 and CASPR2 encephalitis frequently involved the mesial temporal region (P = 0.004), while ASL revealed hyperperfusion of the contralateral basal ganglia in faciobrachial dystonic seizures (P = 0.016). GAD65 encephalitis predominantly affected the cerebellum (P = 0.002), and NMDA encephalitis showed contrast enhancement in five cases (P = 0.045). MRI was not useful for predicting short-term outcomes but was associated with long-term outcomes; specifically, a normal MRI was linked to a better long-term outcome in 47.8% of patients (P = 0.035), and resolution of abnormalities correlated with a favorable FIM score (>54) in 76.7% (P = 0.016).ConclusionMRI is valuable for early detection of seizures or dementia as initial manifestations of AIE and for differentiating AIE subtypes. Follow-up MRI is significant in predicting long-term outcomes.
Insights
Magnetic resonance imaging (MRI) aids in diagnosing autoimmune encephalitis (AIE) and differentiating subtypes. Follow-up MRI is crucial for predicting long-term patient outcomes.
Area of Science:
- Neurology
- Radiology
- Immunology
Background:
- The diagnostic and prognostic utility of magnetic resonance imaging (MRI) in autoimmune encephalitis (AIE) is not well-established.
- Limited data exist on MRI's role in AIE diagnosis, treatment monitoring, and outcome prediction.
Purpose of the Study:
- To determine if MRI can serve as a diagnostic and prognostic marker for AIE.
- To assess MRI's effectiveness in distinguishing between different AIE subtypes.
Main Methods:
- Analysis of prospective data from 96 AIE patients.
- Utilized MRI sequences including FLAIR, diffusion, SWI, T2WI, ASL, and contrast enhancement.
- Assessed short-term outcomes with Modified Rankin Scale (mRS) and long-term outcomes with Functional Independence Measure (FIM).
Main Results:
- MRI confirmed AIE in 82.1% of patients with new-onset seizures and 100% with dementia.
- Antibody-negative AIE showed more FLAIR abnormalities than antibody-positive cases.
- Specific MRI findings correlated with AIE subtypes (e.g., mesial temporal involvement in LGI1/CASPR2 encephalitis, cerebellar predilection in GAD65 encephalitis).
- A normal MRI predicted better long-term outcomes (47.8%), and resolution of abnormalities correlated with favorable FIM scores (76.7%).
Conclusions:
- MRI is valuable for the early detection of AIE manifestations like seizures and dementia.
- MRI effectively differentiates between various AIE subtypes based on distinct imaging patterns.
- Follow-up MRI assessments are significant predictors of long-term functional outcomes in AIE patients.
