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Brain MRI: MRI brain scan (in the axial planeâthat is, slicing from front-to-back and side-to-side through the head) showing a brain tumor at the bottom right. The fMRI is a series of MRIs that measures both the structure and the functional activity of the brain through computer adaptation of multiple images.
MRI is especially useful in diagnosing brain tumors because it can see through the bones of the skull to the tissue underneath. A special dye may be used to enhance the likelihood of detecting a brain tumor. The doctor may also request other tests such as: A skull x-ray can show changes in the bones of the skull caused by a tumor. It can also show calcium deposits, which are present in some types of brain tumors. A brain scan reveals areas of abnormal growth in the brain and records them on special film. A small amount of a radioactive material is injected into a vein.