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An artery feeding the brain gradually crusts over inside until one day it becomes plugged completely.
A small balloon-like swelling appears on the side of an artery in the brain and eventually enlarges as a result of increased blood pressure. Ultimately it will rupture and bleeding into brain tissue will occur. Or possibly a blood clot enters an artery that feeds the brain. Its progress gradually slows as the vessel branches and becomes smaller. Suddenly it cannot pass any farther, and the vessel is completely occluded.