Leaky blood vessels stroke link

"One in five strokes may be caused by a weakening of the tiny arteries in the brain, a new study has found. The brain damage caused by lacunar strokes, which occur in tiny rather than large arteries, may be caused by a gradual weakening of the artery wall. It was previously thought this type of stroke was caused only by reduced blood flow to the brain. Edinburgh University experts believe the weakening occurs in the protective lining of the small arteries" - BBC