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MRI and diffusion MRI in nonparaneoplastic limbic encephalitis.

R N Sener1

  • 1Department of Radiology, Ege University Hospital, 35100 Bornova, Izmir, Turkey. rnsener@hotmail.com

Computerized Medical Imaging and Graphics : the Official Journal of the Computerized Medical Imaging Society
|September 3, 2002
PubMed
Summary

This study details a case of nonparaneoplastic limbic encephalitis in a 65-year-old woman. Despite MRI findings mimicking cytotoxic edema in the medial temporal lobes, normal apparent diffusion coefficient values excluded this diagnosis, with lesions resolving over time.

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Area of Science:

  • Neurology
  • Radiology
  • Neuroimaging

Background:

  • Nonparaneoplastic limbic encephalitis is a rare autoimmune disorder affecting the medial temporal lobes.
  • Distinguishing limbic encephalitis from other conditions with similar imaging findings is crucial for accurate diagnosis and treatment.

Observation:

  • A 65-year-old woman presented with symptoms suggestive of limbic encephalitis.
  • Magnetic resonance imaging (MRI) revealed diffuse, symmetrical, bilateral high-signal lesions in the medial temporal lobes.
  • These lesions were hyperintense on heavily diffusion-weighted imaging (b=1000 s/mm²), mimicking cytotoxic edema.

Findings:

  • Apparent diffusion coefficient (ADC) values in the affected temporal lobes were within normal limits (0.96 and 0.97 x 10⁻³ mm²/s).
  • Normal ADC values excluded cytotoxic edema as the cause of the observed MRI signal changes.

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  • Follow-up MRI at 9 months demonstrated complete resolution of the medial temporal lobe lesions.

    • Implications:

    • This case highlights the importance of integrating diffusion-weighted imaging (DWI) and ADC values for accurate interpretation of medial temporal lobe lesions.
    • The findings suggest that nonparaneoplastic limbic encephalitis can present with DWI hyperintensity without true cytotoxic edema.
    • Understanding these imaging nuances aids in differentiating limbic encephalitis from conditions like stroke or infection, guiding appropriate clinical management.