title: Case report: the vanishing ring sign--an unusual CT manifestation of multiple sclerosis.
abstract: Ring-like computed tomographic (CT) enhancement of a solitary cerebral mass usually indicates neoplasm or abscess. A 64-year-old man with this sign was found to have multiple sclerosis (MS), and following oral steroid treatment, it disappeared.
authors.affiliation: Department of Radiology, Royal Gwent Hospital, Newport.
authors.forename: K G
authors.initials: KG
authors.lastname: Thomas
authors.forename: G J
authors.initials: GJ
authors.lastname: Griffiths
mesh_terms: D001921:Brain / Q000000981:diagnostic imaging*; D001927:Brain Diseases / Q000000981:diagnostic imaging*; D006801:Humans; D008297:Male; D008875:Middle Aged; D009103:Multiple Sclerosis / Q000000981:diagnostic imaging* / Q000188:drug therapy; D013256:Steroids / Q000627:therapeutic use; D014057:Tomography, X-Ray Computed
chemical_list: D013256:Steroids