Dr. Daniel Simon points to the dye running through the jugular vein of Neelima Raval, 38, who has lived with multiple sclerosis for 13 years, and who is being tested for narrowed veins by Dr. Simon at the John F. Kennedy Medical Center in Edison, N.J.

Dr. Daniel Simon points to the dye running through the jugular vein of Neelima Raval, 38, who has lived with multiple sclerosis for 13 years, and who is being tested for narrowed veins by Dr. Simon at the John F. Kennedy Medical Center in Edison, N.J., June, 8, 2010. Dr. Paolo Zamboni, a vascular surgeon from Italy, believes that the disease, which damages the nervous system, may be caused by narrowed veins in the neck and chest that block the drainage of blood from the brain, and has reported in medical journals that opening those veins with the kind of balloons used to treat blocked heart arteries can relieve symptoms. (Beatrice de Gea/The New York Times)