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Progressive multifocal leukoencephalopathy

Thomas Weber1

  • 1Neurologische Klinik, Marienkrankenhaus Hamburg, Academic Teaching Hospital, University of Hamburg, Alfredstr. 9, D-22087 Hamburg, Germany. dr.thomas.weber@hanse.net

Neurologic Clinics
|July 29, 2008
PubMed

Insights

Progressive multifocal leukoencephalopathy (PML) incidence has risen due to the AIDS pandemic. Diagnosis involves MRI and JC virus DNA detection, with treatment focused on immune system restoration or cessation of immunosuppression.

Area of Science:

  • Neurology
  • Infectious Diseases
  • Immunology

Background:

  • Progressive multifocal leukoencephalopathy (PML) incidence has increased fivefold, primarily linked to the AIDS pandemic.
  • PML is an opportunistic infection often associated with HIV infection (85% of cases).
  • Symptoms are diverse, including weakness, speech and visual disturbances, incoordination, and cognitive deficits.

Purpose of the Study:

  • To summarize the incidence, presentation, diagnosis, and treatment of Progressive Multifocal Leukoencephalopathy (PML).

Main Methods:

  • Magnetic Resonance Imaging (MRI) for lesion detection.
  • Cerebrospinal fluid (CSF) analysis via JC viral DNA amplification (spinal tap).

Main Results:

  • MRI reveals T2-hyperintense white matter lesions, sparing subcortical U-fibers; high sensitivity but low specificity.
  • JC viral DNA amplification demonstrates 80% sensitivity and nearly 100% specificity for PML diagnosis.
  • Effective treatment relies on immune reconstitution in HIV patients or withdrawal of immunosuppression in cancer patients.

Conclusions:

  • PML is a significant opportunistic infection in immunocompromised individuals, particularly those with HIV/AIDS.
  • Diagnostic accuracy is high with a combination of neuroimaging and molecular testing.
  • Therapeutic success is contingent upon restoring immune function or reducing immunosuppressive pressure.

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