![]() About 20% of patients who have had a subarachnoid hemorrhage have multiple aneurysms.Īlthough it is not possible to predict whether an aneurysm will rupture, an aneurysm is more likely to rupture when it has a diameter of 7 millimeters or more. When a subarachnoid hemorrhage is caused by a ruptured saccular aneurysm, the aneurysm usually is located where a blood vessel branches from one of these large arteries. Several large arteries form a circle at the base of your brain. A subarachnoid hemorrhage also can occur because blood leaks from an abnormal tangle of blood vessels called an arteriovenous malformation (AVM). The sac-like bulge is called a saccular aneurysm. Most often, a subarachnoid hemorrhage happens because a bulge in the wall of an artery ruptures. An artery spasm can cause additional new brain damage. In the days that immediately follow the bleeding, chemical irritation from clotted blood around the brain can cause brain arteries to go into spasm. The increased pressure can interfere with brain function. As blood flows into the cerebral spinal fluid, it increases the pressure that surrounds the brain. It mixes with the cerebrospinal fluid that cushions the brain and spinal cord. It can cause permanent brain damage.īlood from a subarachnoid hemorrhage pulses into the space between the brain and the skull. Subarachnoid hemorrhage is a type of stroke. This bleeding often causes a sudden, severe headache. Last updated on Feb 28, 2022.Ī subarachnoid hemorrhage is bleeding from a damaged artery at the surface of the brain. ![]()
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