title: Development of polymyositis after long-standing rheumatoid arthritis.
abstract: Rheumatoid arthritis (RA) and polymyositis (PM) are distinct clinical syndromes. The concurrent diagnoses of RA and PM in the same patient are rare. We describe a patient who developed outright PM after 16 years of well established RA, review the literature, and highlight the need to consider a broad base of differentials including PM in the diagnosis of muscle weakness in RA.
authors.affiliation: Department of Rheumatology, St. Michael's Hospital, University of Toronto, Ontario, Canada.
authors.forename: Sherry
authors.initials: S
authors.lastname: Rohekar
authors.forename: Laurence
authors.initials: L
authors.lastname: Rubin
mesh_terms: D000328:Adult; D001172:Arthritis, Rheumatoid / Q000150:complications* / Q000188:drug therapy / Q000503:physiopathology; D005260:Female; D005938:Glucocorticoids / Q000627:therapeutic use; D006801:Humans; D017285:Polymyositis / Q000188:drug therapy / Q000209:etiology* / Q000503:physiopathology; D016896:Treatment Outcome
chemical_list: D005938:Glucocorticoids