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Progressive multifocal leukoencephalopathy: the evolution of a disease once considered rare
1Department of Neurology, University of Miami School of Medicine, Florida 33136, USA.
Abstract:
Progressive multifocal leukoencephalopathy, a formerly rare disease that chiefly occurred in persons with underlying lymphoma and chronic lymphocytic leukemia, is now seen with increasing frequency in the era of acquired immunodeficiency syndrome. Progressive multifocal leukoencephalopathy is currently estimated to arise in 5% of all human immunodeficiency virus-infected individuals. The clinical features of the disorder in patients with acquired immunodeficiency syndrome do not appear to be significantly different from progressive multifocal leukoencephalopathy occurring in association with other immunosuppressive disorders. Radiographically, the appearance of HIV dementia on magnetic resonance imaging is sometimes confused with that of progressive multifocal leukoencephalopathy. Among the characteristics that are helpful in distinguishing between the two disorders are the presence of focal findings, the rate of disease progression, the specific magnetic resonance imaging attributes, including the location of the lesions, and certain cerebrospinal fluid parameters, including surrogate markers for human immunodeficiency virus dementia and the presence of myelin basic protein. The remarkable increase in the burden of progressive multifocal leukoencephalopathy has provided a vital impetus for its study, particularly with respect to diagnosis and therapy. Establishing an unequivocal diagnosis of progressive multifocal leukoencephalopathy currently requires brain biopsy. The application of polymerase chain reaction for JC virus amplification to cerebrospinal fluid samples suggests that it may provide an alternative means of diagnosis. Recent in vitro studies of cytosine arabinoside and camptothecin suggest that they, or similar agents, may prove useful in the treatment of this illness and well-designed clinical trials are underway.
Insights
Progressive multifocal leukoencephalopathy (PML) is increasingly common in individuals with acquired immunodeficiency syndrome (AIDS). Diagnosis can be challenging, but polymerase chain reaction (PCR) and imaging show promise for identifying PML.
Area of Science:
- Neurology
- Infectious Diseases
- Virology
Background:
- Progressive multifocal leukoencephalopathy (PML) was historically rare, primarily affecting individuals with hematologic malignancies.
- PML incidence has significantly increased in the context of acquired immunodeficiency syndrome (AIDS).
- Approximately 5% of individuals with human immunodeficiency virus (HIV) infection develop PML.
Purpose of the Study:
- To review the clinical and diagnostic features of PML in the context of HIV/AIDS.
- To explore differentiating factors between PML and HIV dementia on magnetic resonance imaging (MRI).
- To discuss advancements in PML diagnosis and potential therapeutic strategies.
Main Methods:
- Review of clinical presentations and radiographic findings in PML patients with HIV/AIDS.
- Comparison of MRI characteristics to distinguish PML from HIV dementia.
- Evaluation of cerebrospinal fluid (CSF) parameters as diagnostic markers.
- Assessment of polymerase chain reaction (PCR) for JC virus detection in CSF.
- Review of in vitro studies on potential therapeutic agents like cytosine arabinoside.
Main Results:
- Clinical features of PML in AIDS patients are similar to those in other immunosuppressed individuals.
- Distinguishing PML from HIV dementia requires analysis of focal findings, lesion progression, MRI attributes, and CSF parameters.
- Brain biopsy remains the gold standard for definitive PML diagnosis.
- PCR for JC virus in CSF offers a potential alternative diagnostic method.
- In vitro studies suggest cytosine arabinoside and camptothecin as potential treatments.
Conclusions:
- PML is a significant opportunistic infection in the HIV/AIDS era, necessitating improved diagnostic and therapeutic approaches.
- Advanced imaging and CSF analysis, including PCR, can aid in differentiating PML from HIV dementia.
- Ongoing research and clinical trials are crucial for developing effective treatments for PML.