On the left is a normal axial MRI image of the brain through both cerebral hemispheres. At this level you see two large cavities filled with dark material. These are the lateral ventricles which are filled with cerebral spinal fluid (CSF). There are two main types of brain tissue, gray matter (which contains the neuronal cell bodies and is the darker of the brain tissue shown) and white matter (which is composed of axonal fibers). On the right is an axial MRI scan of a brain showing multiple malignant tumors. These tumor nodules are surrounded by extensive swelling.

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