When a balloon bursts open, air escapes but when a brain aneurysm bursts open, blood is spilled into the brain causing life-threatening hemorrhage called subarachnoid hemorrhage (click to read more). This is a type of stroke that is a life-threatening emergency. Below is a diagram that illustrates the growth of a brain aneurysm, rupture of the brain aneurysm and treatment with open surgery clipping. With so much technological advances, many brain aneurysms can be treated minimally invasively, without open brain surgery clipping. Click here to read about the newest minimally invasive treatment for brain aneurysms.
https://resident360.nejm.org/content_items/subarachnoid-hemorrhage/
Dr. Li-Mei Lin 