title: Aspects on the variability of progressive multifocal leukoencephalopathy.
mesh_terms: D000368:Aged; D002467:Cell Nucleus; D002540:Cerebral Cortex / Q000473:pathology; D003711:Demyelinating Diseases / Q000473:pathology; D005260:Female; D005625:Frontal Lobe / Q000473:pathology; D006801:Humans; D007938:Leukemia / Q000473:pathology; D007968:Leukoencephalopathy, Progressive Multifocal / Q000209:etiology / Q000473:pathology*; D008297:Male; D008854:Microscopy, Electron; D008875:Middle Aged; D009457:Neuroglia; D027383:Papillomaviridae / Q000302:isolation & purification; D027382:Polyomaviridae