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[Progressive multifocal encephalitis (PML)]
Abstract:
In four cases of progressive multifocal leucoencephalitis the basic disease was always a malignant lymphogranuloma. Changes in the brain were multifocal, however the frontoparietal area of the white matter was affected most frequently and foci in this part were oldest. In these foci demyelination with atypical astrogliosis predominated, and there was a very small number of scavenger cells. At the periphery of foci always proliferation and enlargement of homogenous oligodendroglia nuclei were found sometimes with inclusions which in immunoassay sometimes had a common antigen with papovirus SV 40 and on electronoptic examination always contained many virions of the papovirus. No direct relationship was found between the duration of the neoplastic process, its type and changes in the CNS.
Insights
Progressive multifocal leukoencephalopathy (PML) in four cases was linked to malignant lymphogranuloma. Brain lesions showed demyelination and atypical astrogliosis, with papovavirus identified in oligodendroglia.
Area of Science:
- Neurology
- Virology
- Oncology
Context:
- Malignant lymphogranuloma is a neoplastic process.
- Progressive multifocal leukoencephalopathy (PML) is a rare demyelinating disease of the central nervous system.
- The association between these conditions requires further investigation.
Purpose:
- To investigate the neuropathological findings in four cases of PML.
- To identify the causative agent and its relationship with the underlying neoplastic disease.
- To characterize the brain lesions associated with PML in the context of malignant lymphogranuloma.
Summary:
- Four cases of PML were associated with malignant lymphogranuloma.
- Brain lesions predominantly affected the frontoparietal white matter, showing demyelination and atypical astrogliosis.
- Papovavirus virions were consistently found in enlarged oligodendroglia nuclei at the periphery of lesions, suggesting a viral etiology for PML.
Impact:
- This study highlights the neuropathological features of PML in patients with malignant lymphogranuloma.
- It confirms the presence of papovavirus in PML lesions, reinforcing its role in the disease pathogenesis.
- Findings contribute to understanding CNS complications in immunocompromised patients with neoplastic diseases.