title: Systemic mastocytosis associated with presence of rheumatoid factor.
abstract: We encountered a case of systemic mast cell disease associated with rheumatoid factor; to our knowledge, this has not been reported in the literature. Rheumatoid arthritis as an unrelated second disease cannot be excluded, but there is support for a relation between joint symptoms, rheumatoid factor, and the mast cell disease.
mesh_terms: D005260:Female; D006801:Humans; D007719:Knee Joint; D008875:Middle Aged; D010026:Osteosclerosis / Q000473:pathology; D012008:Recurrence; D012217:Rheumatoid Factor / Q000032:analysis*; D013582:Synovial Fluid / Q000032:analysis; D013997:Time Factors; D014582:Urticaria Pigmentosa / Q000276:immunology / Q000473:pathology*
chemical_list: D012217:Rheumatoid Factor