highresolution mri vessel wall imaging spatial and temporal patterns of reversible cerebral vasoconstriction syndrome and central nervous system vasculitis background and purpose highresolution mr imaging is an emerging tool for evaluating intracranial artery disease it has an advantage of defining vessel wall characteristics of intracranial vascular diseases we investigated highresolution mr imaging arterial wall characteristics of cns vasculitis and reversible cerebral vasoconstriction syndrome to determine wall pattern changes during a followup periodmaterials and methods we retrospectively reviewed 3thighresolution mr imaging vessel wall studies performed on 26 patients with a confirmed diagnosis of cns vasculitis and reversible cerebral vasoconstriction syndrome during a followup period vessel wall imaging protocol included blackblood contrastenhanced t1weighted sequences with fat suppression and a saturation band and timeofflight mra of the circle of willis vessel wall characteristics including enhancement wall thickening and lumen narrowing were collectedresults thirteen patients with cns vasculitis and 13 patients with reversible cerebral vasoconstriction syndrome were included in the cns vasculitis group 9 patients showed smooth concentric wall enhancement and thickening 3 patients had smooth eccentric wall enhancement and thickening and 1 patient was without wall enhancement and thickening six of 13 patients had followup imaging 4 patients showed stable smooth concentric enhancement and thickening and 2 patients had resoluton of initial imaging findings in the reversible cerebral vasoconstriction syndrome group 10 patients showed diffuse uniform wall thickening with negligibletomild enhancement nine patients had followup imaging with 8 patients showing complete resolution of the initial findingsconclusions postgadolinium 3thighresolution mr imaging appears to be a feasible tool in differentiating vessel wall patterns of cns vasculitis and reversible cerebral vasoconstriction syndrome changes during a followup period