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Related Concept Videos

Arboviral Encephalitis01:25

Arboviral Encephalitis

42
Arboviral encephalitis refers to brain inflammation caused by arthropod-borne viruses, particularly those transmitted through mosquito vectors. Among these, West Nile virus (WNV), a member of the Flaviviridae family, is a significant public health concern. WNV is an enveloped, positive-sense, single-stranded RNA virus. Human infection typically begins when an infected mosquito introduces the virus into the dermis during feeding. The primary transmission cycle involves birds as amplifying hosts...
42

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Related Experiment Video

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Induction and Diverse Assessment Indicators of Experimental Autoimmune Encephalomyelitis
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Progressive multifocal leukoencephalopathy associated with immune dysregulation.

Odunayo Yusuf1, Mai Elrayes2, Khuloud Elsabbagh2

  • 1Internal Medicine, Manchester University NHS Foundation Trust, Manchester, UK.

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|April 10, 2026
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Summary

Progressive multifocal leukoencephalopathy (PML) can occur in patients with subtle immune issues, not just severe immunosuppression. This case highlights the need for advanced immune testing beyond T-cell counts for diagnosis.

Keywords:
ImmunologyInfectious diseasesNeurology

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Area of Science:

  • Neuroimmunology
  • Viral Neurology

Background:

  • Progressive multifocal leukoencephalopathy (PML) is a rare, opportunistic demyelinating disease of the central nervous system.
  • PML is caused by the John Cunningham (JC) virus, typically in severely immunocompromised individuals.
  • Subtle immune dysregulation can also predispose individuals to PML.

Purpose of the Study:

  • To report a case of PML in a patient with autoimmune hepatitis-primary biliary cholangitis overlap syndrome on low-dose corticosteroids.
  • To highlight diagnostic challenges and the utility of extended immune profiling in atypical PML presentations.

Main Methods:

  • Case report of a woman in her 40s with autoimmune hepatitis-primary biliary cholangitis.
  • Clinical assessment, MRI, cerebrospinal fluid (CSF) analysis for JC viral DNA, and comprehensive immunophenotyping.
  • Analysis included CD4+, CD8+, CD19+ T-cell and B-cell counts, and immunoglobulin levels.

Main Results:

  • The patient presented with cerebellar symptoms and MRI findings consistent with PML.
  • JC viral DNA was detected in CSF.
  • Despite normal T-cell counts, immunophenotyping revealed significant B-cell lymphopenia, polyclonal hypergammaglobulinaemia, and elevated free light chains, indicating functional immunodeficiency.

Conclusions:

  • PML diagnosis can be challenging in patients with seemingly preserved T-cell immunity.
  • Extended immune profiling, including B-cell enumeration and immunoglobulin analysis, is valuable for atypical PML cases.
  • Therapeutic decisions require balancing immune reconstitution with autoimmune disease management.