[Electron microscopic observations on 4 cases of progressive multifocal leukoencephalopathy in Japan].
D000328:Adult; D000368:Aged; D001921:Brain / Q000473:pathology; D004660:Encephalitis / Q000473:pathology*; D005260:Female; D006801:Humans; D007564:Japan; D008297:Male; D008854:Microscopy, Electron; D027383:Papillomaviridae / Q000302:isolation & purification; D027382:Polyomaviridae