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The clinical features of PML

Joseph R Berger1

  • 1Department of Neurology, University of Kentucky Medical Center, KY Clinic (Wing D) - L445, Lexington, KY 40536-0284, USA. jrbneuro@email.uky.edu

Cleveland Clinic Journal of Medicine
|November 30, 2011
PubMed

Insights

Progressive multifocal leukoencephalopathy (PML) symptoms vary by lesion location. Diagnosis relies on JC virus detection, clinical signs, and MRI, with improved prognosis due to immune reconstitution.

Area of Science:

  • Neurology
  • Infectious Diseases
  • Oncology

Background:

  • Progressive multifocal leukoencephalopathy (PML) is a rare, demyelinating disease of the central nervous system.
  • PML is caused by the John Cunningham virus (JCV).
  • PML is often associated with conditions that weaken the immune system, such as acquired immunodeficiency syndrome (AIDS) and certain immunosuppressive therapies.

Purpose of the Study:

  • To describe the clinical presentation, diagnosis, and prognosis of PML.
  • To highlight the increasing association of PML with biologic agents, specifically natalizumab.
  • To discuss the diagnostic methods and the impact of immune reconstitution on patient outcomes.

Main Methods:

  • Review of clinical data and diagnostic findings in PML patients.
  • Detection of JCV DNA in cerebrospinal fluid (CSF) via polymerase chain reaction (PCR).
  • Magnetic resonance imaging (MRI) to identify PML brain lesions.

Main Results:

  • PML symptoms correlate with the location of brain lesions, including visual, cognitive, and motor deficits.
  • Natalizumab, a biologic agent, is now a leading cause of PML, second only to AIDS.
  • Diagnosis typically involves a combination of clinical presentation, CSF JCV PCR, and MRI findings.

Conclusions:

  • While brain biopsy is definitive, non-invasive methods are now standard for PML diagnosis.
  • Immune reconstitution has significantly improved the prognosis for patients with PML.
  • Increased awareness of PML in patients receiving immunosuppressive therapies is crucial.

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