MSLeaders Experts' Exchange is where you can present your own clinical challenges to leading MS experts and also review a growing collection of archived exchanges. Below, read an Experts' Exchange that stemmed from "PML: What MS-Treating Clinicians Need to Know." If you haven't watched the program yet, click here to launch. Experts' Exchange I understand that finding JC virus in the CSF of patients can confirm the diagnosis of PML, but I've heard that some MS patients can have JCV DNA in their CSF even in the absence of any other evidence of PML. Do these represent "false positives" and if so how should they be treated? Click here for Dr. Clifford’s response David B. Clifford, MD Seay Professor of Clinical Neuropharmacology Washington University in St. Louis St. Louis, MO We hope you enjoy the Experts' Exchange, as well as the growing library of programs available at MSLeaders.org. Sincerely, Thomas Mundy, MD Medical Director Healthology

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