Exacerbation of Multiple Sclerosis by BRAF/MEK Treatment for Malignant Melanoma: The Central Vein Sign to Distinguish Demyelinating Lesions From Metastases oleh Christopher C. Hemond MD, Rohit Bakshi MD, MA, Shahamat Tauhid MD, Rosila Sarrosa, Madison Ryan, Vineetha Kamath, James Thomas MD, Keith R. Edwards MD