![]() In: Bradley and Daroff's Neurology in Clinical Practice. Intracranial aneurysms and subarachnoid hemorrhage. American Association of Neurological Surgeons. National Institute of Neurological Disorders and Stroke. Unruptured intracranial aneurysm: Screening, prevalence and risk factors. Unruptured intracranial aneurysm (adult). A drop in blood sodium levels can lead to swelling of brain cells and permanent damage. This may occur from damage to the hypothalamus, an area near the base of the brain. Bleeding in the brain can disrupt the balance of sodium in the blood. As a result, an excess of fluid puts pressure on the brain and can damage tissues. The blood can block the movement of fluid that surrounds the brain and spinal cord. Most often, a ruptured brain aneurysm occurs in the space between the brain and the thin tissues covering the brain. A buildup of fluid within the brain (hydrocephalus).This condition can cause an ischemic stroke, in which there's limited blood flow to brain cells, causing additional cell damage and loss. After a brain aneurysm ruptures, blood vessels in the brain may contract and narrow (vasospasm). ![]() Re-bleeding can cause further damage to brain cells. An aneurysm that has ruptured or leaked is at risk of bleeding again. If the pressure becomes too high, it may disrupt the blood and oxygen supply to the brain and loss of consciousness or even death may occur.Ĭomplications that can develop after the rupture of an aneurysm include: It also increases pressure inside the skull. However, the blood can cause direct damage to surrounding cells, and the bleeding can damage or kill other cells. When a brain aneurysm ruptures, the bleeding usually lasts only a few seconds. Family history of brain aneurysm, particularly a first-degree relative, such as a parent, brother, sister or child.Brain arteriovenous malformation (AVM), in which the arteries and veins in the brain are tangled, interrupting blood flow.Narrow aorta (coarctation of the aorta), the large blood vessel that delivers oxygen-rich blood from the heart to the body.Polycystic kidney disease, an inherited disorder that results in fluid-filled sacs in the kidneys and usually increases blood pressure.Inherited connective tissue disorders, such as Ehlers-Danlos syndrome, that weaken blood vessels.Some conditions that are present at birth can be associated with an elevated risk of developing a brain aneurysm. Some types of aneurysms may occur after a head injury or from certain blood infections. ![]()
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