title: Case report. Multiple sclerosis: large plaque causing mass effect and ring sign.
mesh_terms: D000328:Adult; D001921:Brain / Q000000981:diagnostic imaging*; D001932:Brain Neoplasms / Q000000981:diagnostic imaging; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D009103:Multiple Sclerosis / Q000000981:diagnostic imaging*; D011877:Radionuclide Imaging; D014057:Tomography, X-Ray Computed