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Limbic encephalitis occurring in association with Alzheimer's disease
R C Sutton1, M H Lipper, H R Brashear
1Department of Neurology, University of Virginia School of Medicine, Charlottesville 22908.
Journal of Neurology, Neurosurgery, and Psychiatry
|July 1, 1993
Summary
Paraneoplastic limbic encephalitis, a rare cause of dementia, can be challenging to diagnose. This case highlights the importance of antineuronal antibody screening and MRI in identifying this condition, especially when co-occurring with Alzheimer's disease.
Area of Science:
- Neurology
- Oncology
- Immunology
Background:
- Paraneoplastic limbic encephalitis (PLE) is a rare neurological disorder associated with cancer.
- It often presents as subacute cognitive decline, mimicking other neurodegenerative diseases.
- Small-cell lung carcinoma is a common underlying malignancy in PLE.
Observation:
- A patient with small-cell lung carcinoma presented with subacute cognitive impairment.
- The cognitive symptoms were initially attributed to concurrent Alzheimer's disease.
- Magnetic Resonance Imaging (MRI) showed increased T2 signal in the medial temporal lobes.
Findings:
- Necropsy revealed inflammatory pathology in the medial temporal lobes, correlating with MRI findings.
- High titers of type II antineuronal antibody (anti-Hu) were detected.
- Immunofluorescence confirmed IgG deposition on remaining neurons in the temporal lobe.
Implications:
- This case underscores the diagnostic challenges of PLE, particularly when co-existing with Alzheimer's disease.
- Antineuronal antibody screening and MRI are crucial diagnostic tools for identifying PLE.
- Early detection and diagnosis of PLE are vital for appropriate management and treatment.