A brain aneurysm is usually diagnosed using an MRI scan and angiography (MRA or a CT scan and angiography (CTA)
An MRI scan is usually used to look for aneurysms in the brain that haven’t ruptured. This type of scan uses strong magnetic fields and radio waves to produce detailed images of your brain.
A CT scan is usually preferred if it’s thought the aneurysm has ruptured and there’s bleeding on the brain. This type of scan takes a series of X-rays, which are then assembled by a computer into a detailed 3D image.
In some cases, a ruptured aneurysm is not picked up by a CT scan. 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... Read more