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[Progressive multifocal leukoencephalopathy as initial manifestation of acquired immunodeficiency].

This is a report of a man with acquired immunodeficiency syndrome (AIDS) who presented acutely ill with severe progressive multifocal leukoencephalopathy (PML) as the first manifestation of AIDS. PML was diagnosed in the brain after gross and microscopical examination as well as by immunohistochemistry with an antibody against JC virus.