A study released in March in the medical journal Blood linked Rituxan to 57 cases of progressive multifocal leukoencephalitis, or PML, between 1997 and 2008.    From Wordnik.com.  [FDA Weighs the Risks of Rituxan] Reference

A brain biopsy and a spinal tap confirmed the diagnosis of a swiftly moving and often fatal viral brain infection called progressive multifocal leukoencephalitis (PML) that attacks the brain's white matter.    From Wordnik.com.  [EurekAlert! - Breaking News] Reference

Present in 70\% to 90\% of human beings, the virus, once activated, inflames the white matter of the brain - a condition known as progressive multifocal leukoencephalitis (PML) - which has no cure and is almost always fatal.    From Wordnik.com.  [Original Signal - Transmitting Buzz] Reference

Acute hemorrhagic leukoencephalitis Hurst’s disease.    From Wordnik.com.  [The Autoimmune Epidemic] Reference