<prompt> Answer this question truthfullyWhat are the two main causes of cerebrovascular disease and what percentage of cases do they each account for?  <response>: <reason> Cerebrovascular disease is caused by ischemia, which accounts for 85 of cases, or hemorrhage, which accounts for 15 of cases. Ischemia occurs when the blood flow to the brain is blocked or reduced, often due to a blood clot or narrowed blood vessels. Hemorrhage, on the other hand, occurs when a blood vessel in the brain ruptures and bleeds into the surrounding tissue. Both types of cerebrovascular disease can cause serious damage to the brain and require prompt medical attention. 