title: An unusual cause of joint swelling in rheumatoid arthritis.
abstract: We describe a patient with longstanding rheumatoid arthritis (RA) who developed a monoarticular swelling of the left elbow which proved to be due to non-Hodgkin's lymphoma (NHL) infiltration of skin and subcutaneous tissue.
authors.affiliation: Department of Rheumatology, University Hospital of South Manchester.
authors.forename: J M
authors.initials: JM
authors.lastname: Findeisen
authors.forename: R B
authors.initials: RB
authors.lastname: Clague
mesh_terms: D001172:Arthritis, Rheumatoid / Q000150:complications*; D004487:Edema / Q000209:etiology*; D004551:Elbow Joint; D004890:Erythema / Q000209:etiology; D006801:Humans; D007592:Joint Diseases / Q000209:etiology*; D008228:Lymphoma, Non-Hodgkin / Q000150:complications* / Q000473:pathology; D008297:Male; D008875:Middle Aged