PMID- 27994897 OWN - NLM STAT- PubMed-not-MEDLINE LR - 20201229 IS - 2090-6668 (Print) IS - 2090-6676 (Electronic) IS - 2090-6676 (Linking) VI - 2016 DP - 2016 TI - Progressive Multifocal Leukoencephalopathy in a Multiple Sclerosis Patient Diagnosed after Switching from Natalizumab to Fingolimod. PG - 5876798 LID - 5876798 AB - Background. Natalizumab- (NTZ-) associated progressive multifocal leukoencephalopathy (PML) is a severe and often disabling infectious central nervous system disease that can become evident in multiple sclerosis (MS) patients after NTZ discontinuation. Recently, novel diagnostic biomarkers for the assessment of PML risk in NTZ treated MS patients such as the anti-JC virus antibody index have been reported, and the clinical relevance of milky-way lesions detectable by MRI has been discussed. Case Presentation and Conclusion. We report a MS patient in whom PML was highly suspected solely based on MRI findings after switching from NTZ to fingolimod despite repeatedly negative (ultrasensitive) polymerase chain reaction (PCR) testing for JC virus DNA in cerebrospinal fluid. The PML diagnosis was histopathologically confirmed by brain biopsy. The occurrence of an immune reconstitution inflammatory syndrome (IRIS) during fingolimod therapy, elevated measures of JCV antibody indices, and the relevance of milky-way-like lesions detectable by (7 T) MRI are discussed. FAU - Sinnecker, Tim AU - Sinnecker T AD - Department of Neurology, Asklepios Fachklinikum Teupitz, Teupitz, Germany; NeuroCure Clinical Research Center, Charite-Universitatsmedizin Berlin, Berlin, Germany; Department of Neurology, Universitatsspital Basel, Basel, Switzerland. FAU - Othman, Jalal AU - Othman J AD - Department of Neurology, Asklepios Fachklinikum Teupitz, Teupitz, Germany. FAU - Kuhl, Marc AU - Kuhl M AD - Department of Neurology, Asklepios Fachklinikum Teupitz, Teupitz, Germany. FAU - Metz, Imke AU - Metz I AD - Department of Neuropathology, Universitatsmedizin Gottingen, Gottingen, Germany. FAU - Niendorf, Thoralf AU - Niendorf T AD - Berlin Ultrahigh Field Facility, Max Delbruck Center for Molecular Medicine, Berlin, Germany; Experimental and Clinical Research Center, Charite-Universitatsmedizin Berlin and Max Delbruck Center for Molecular Medicine, Berlin, Germany. FAU - Kunkel, Annett AU - Kunkel A AD - Department of Neurology, Asklepios Fachklinikum Teupitz, Teupitz, Germany. FAU - Paul, Friedemann AU - Paul F AUID- ORCID: 0000-0002-6378-0070 AD - NeuroCure Clinical Research Center, Charite-Universitatsmedizin Berlin, Berlin, Germany; Experimental and Clinical Research Center, Charite-Universitatsmedizin Berlin and Max Delbruck Center for Molecular Medicine, Berlin, Germany; Clinical and Experimental Multiple Sclerosis Research Center, Charite-Universitatsmedizin Berlin, Berlin, Germany; Department of Neurology, Charite-Universitatsmedizin Berlin, Berlin, Germany. FAU - Wuerfel, Jens AU - Wuerfel J AD - NeuroCure Clinical Research Center, Charite-Universitatsmedizin Berlin, Berlin, Germany; Medical Imaging Analysis Center AG, Basel, Switzerland. FAU - Faiss, Juergen AU - Faiss J AD - Department of Neurology, Asklepios Fachklinikum Teupitz, Teupitz, Germany. LA - eng PT - Journal Article DEP - 20161122 PL - United States TA - Case Rep Neurol Med JT - Case reports in neurological medicine JID - 101576451 PMC - PMC5138460 COIS- The authors declare that they have no competing interests. EDAT- 2016/12/21 06:00 MHDA- 2016/12/21 06:01 PMCR- 2016/11/22 CRDT- 2016/12/21 06:00 PHST- 2016/06/01 00:00 [received] PHST- 2016/08/21 00:00 [revised] PHST- 2016/10/12 00:00 [accepted] PHST- 2016/12/21 06:00 [entrez] PHST- 2016/12/21 06:00 [pubmed] PHST- 2016/12/21 06:01 [medline] PHST- 2016/11/22 00:00 [pmc-release] AID - 10.1155/2016/5876798 [doi] PST - ppublish SO - Case Rep Neurol Med. 2016;2016:5876798. doi: 10.1155/2016/5876798. Epub 2016 Nov 22.