Central nervous system (CNS) vasculitis is an inflammatory condition of blood vessels of the brain and spinal cord. It may be primary or secondary to a variety of causes.Magnetic resonance imaging (MRI) is a sensitive but not specific detector of vascular disease, disclosing the results of vascular inflammation as infarctions and hemorrhagic lesions, not inflammation itself. There are reported cases of proven CNS vasculitis with normal MRI imaging.Magnetic resonance angiography (MRA) is important in imaging large vessel vasculitis but it does not have sufficient resolution to display medium or small vessel cerebral vasculitis.Magnetic resonance spectroscopy (MRS) is an important procedure in measuring millimolar concentrations of cerebral metabolites induced by ischemia.