Comment on

• Extracranial venous stenosis is an unlikely cause of multiple sclerosis.

  Yamout B, Herlopian A, Issa Z, Habib RH, Fawaz A, Salame J, Wadih A, Awdeh H, Muallem N, Raad R, Al-Kutoubi A. Yamout B, et al. Mult Scler. 2010 Nov;16(11):1341-8. doi: 10.1177/1352458510385268. Mult Scler. 2010. PMID: 21041329
• Report of extracranial venous stenoses in relapsing-remitting multiple sclerosis patients.

  Walker MA. Walker MA. Mult Scler. 2011 May;17(5):642; author reply 643-4. doi: 10.1177/1352458511400477. Epub 2011 Mar 18. Mult Scler. 2011. PMID: 21421808 No abstract available.