This fluid can be analysed for signs of bleeding. If a CT scan is negative but your symptoms strongly suggest you have a ruptured aneurysm, a test called a lumbar puncture will usually be carried out.Ī lumbar puncture is a procedure where a needle is inserted into the lower part of the spine to remove a sample of the fluid (cerebrospinal fluid) that surrounds and supports the brain and spinal cord.
In some cases, a ruptured aneurysm is not picked up by a CT scan. This type of scan takes a series of X-rays, which are then assembled by a computer into a detailed 3D image. This type of scan uses strong magnetic fields and radio waves to produce detailed images of your brain.Ī CT scan is usually preferred if it's thought the aneurysm has ruptured and there's bleeding on the brain (subarachnoid haemorrhage). A brain aneurysm is usually diagnosed using an MRI scan and angiography (MRA), or a CT scan and angiography (CTA).Īn MRI scan is usually used to look for aneurysms in the brain that haven't ruptured.
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