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The arrows indicate that more than one syndrome may coexist. PML = progressive multifocal leukoencephalopathy; JCVE = JC Virus Encephalopathy; JCVM = JC Virus Meningitis; JCV GCN = JC Virus Granule Cell Neuronopathy; GCL = Granule Cell Layer; PCL = Purkinje Cell Layer; ML = Molecular layer; WM = white matter; 
= JC virion
