21.   The clots often traveled through the bloodstream to the brain, causing strokes.

22.   The drug also apparently caused strokes in a few patients with colon cancer.

23.   The factors that can cause stroke are ones you can prevent by choosing the right foods.

24.   They can then dislodge, enter the bloodstream, and race like missiles to the brain, where they can cause strokes.

25.   Two of the surgical options might save her hearing, but those involved pushing back her brain, which could damage it or cause a stroke.

26.   With angiography, Dr. Rymer could see the clot that caused the stroke.

27.   A clot in the brain causes a stroke.

28.   An ischemic stroke is caused when blood vessels are constricted and then finally cut off by a clot.

29.   Broken blood vessels can also cause strokes, and giving TPA to those people makes the situation worse.

30.   Careful diagnosis is important because not all strokes are caused by clots -- some are burst blood vessels that require different treatment, not TPA.