What is a brain aneurysm?
A brain aneurysm is a bulge or ballooning out of a blood vessel in the brain, most often resembling a berry (they are also termed berry aneurysms or cerebral aneurysms). Unfortunately, the walls of the aneurysm are not as stable as normal blood vessel walls. Consequently, brain aneurysms under certain conditions may rupture and allow blood to leak into surrounding tissues. Ruptured aneurysms are medical emergencies; patients with suspected ruptured aneurysms should be seen immediately in emergency departments that have neurosurgeons on call (usually hospitals that handle major trauma have neurosurgeons on call).
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