Strokes caused by an artery tear are landing five times as many Americans in the hospital these days, a new study says. Cervical artery dissection involves a small tear in the inner lining of an artery in the neck that supplies blood to the brain. Advertisement Blood can clot at the site of the tear. If the clot breaks loose, it can travel to the brain and cause a stroke. Hospitalizations for this sort of stroke have increased nearly fivefold during the past 15 years, according to findings