Hemorrhagic stroke accounts for about 17 percent of stroke cases. It results from a weakened vessel that ruptures and bleeds into the surrounding brain. The blood accumulates and compresses the surrounding brain tissue.

Ischemic stroke accounts for about 83 percent of all cases. It results from an obstruction, typically a blood clot. These clots are called a cerebral thrombus (a blood clot that develops in the clogged part of the vessel) or a cerebral embolism (a blood clot that forms at another location in the circulatory system then breaks loose, enters the bloodstream and travels through the brain's blood vessels until it reaches vessels too small to let it pass).

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