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A form of cerebral aneurysm, a focal abnormal dilatation of a blood vessel in the brain. Berry intracranial aneurysms, also known as saccular aneurysms, have a characteristic rounded shape and account for the vast majority of intracranial aneurysms. They are the most common cause of non-traumatic subarachnoid hemorrhage, a sudden-onset disease that can lead to severe disability and death. Several risk factors such as smoking, hypertension, and excessive alcohol intake are associated with subarachnoid hemorrhage.




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