Radionuclide cisternogram

A radionuclide cisternogram is a special kind of test used to look at the pressure inside the space around the brain. During the test, a small amount of a radioactive tracer is injected into a vein in your arm. The tracer travels to the space around your brain and is detected with a special camera that can sense the radiation. From this, the doctor can see if there is too much or too little pressure in the space around your brain. The pressure should be just right so that your brain can work properly.