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Progressive multifocal leukoencephalopathy: analysis of lesion development with diffusion-weighted MRI
I Mader1, U Herrlinger, U Klose
1Department of Neuroradiology, University Hospital Tübingen, Hoppe-Seyler-Strasse 3, 72076 Tübingen, Germany.
Abstract:
Progressive multifocal leukoencephalopathy (PML), caused by replication of JC virus in oligodendrocytes of immunocompromised patients, is diagnosed by polymerase chain reaction-based demonstration of JC virus DNA. We investigated whether MRI might be used to assess disease activity. Diffusion-weighted imaging (DWI) was obtained in two patients with PML, in whom it was the only MRI sequence on which we could identify areas of progressive disease. The extent of abnormal diffusion appeared to correlate with the speed of clinical progression. DWI would thus seem to be of value in patients with PML.
Insights
Progressive multifocal leukoencephalopathy (PML) is diagnosed using JC virus DNA tests. Diffusion-weighted imaging (DWI) on MRI may help assess PML disease activity and correlate with clinical progression.
Area of Science:
- Neurology
- Radiology
- Infectious Diseases
Background:
- Progressive multifocal leukoencephalopathy (PML) is a demyelinating disease affecting immunocompromised individuals.
- JC virus (JCV) replication in oligodendrocytes causes PML, typically diagnosed via JCV DNA detection.
- Assessing PML disease activity and progression is crucial for patient management.
Observation:
- Diffusion-weighted imaging (DWI) was utilized in two patients diagnosed with PML.
- DWI was the sole MRI sequence capable of identifying active disease progression in these patients.
- The extent of abnormal diffusion on DWI correlated with the rate of clinical worsening.
Findings:
- Diffusion-weighted imaging (DWI) shows promise in visualizing active PML lesions.
- Abnormal diffusion on DWI appears to be a quantifiable marker of disease progression.
- MRI, specifically DWI, may offer a non-invasive method to monitor PML activity.
Implications:
- DWI could become a valuable tool for assessing PML disease activity and guiding treatment.
- This technique may improve the monitoring of therapeutic responses in PML patients.
- Further research is warranted to validate DWI's role in managing PML.