Topic: Progressive Multifocal Leukoencephalopathy (PML) Author: Heba Allah Zuhair Huaishan Editor: Abdel Rahman Bani Yassin, Ihda Bani Khalaf Reviewer: Ethar Hazaimeh Key words: JCV, PML, Progressive, multifocal, leukoencephalopathy, double-stranded DNA   Introduction Progressive multifocal leukoencephalopathy (PML) is a rare and frequently deadly viral infection marked by progressive harm or demyelination of the brain’s white matter at various sites1                                                It is induced by JCV (John Cunningham virus), named after the initial patient in whom it was found3. The […]