title: Focal myositis presenting as pseudothrombophlebitis of the arm.
abstract: We described a 21-year-old woman with a diagnosis of Sjögren syndrome that came for consultation with a localized mass over her left arm of fast growth. Lab results were normal; a Doppler ultrasound showed the presence of partial thrombosis in the left axillary vein; a magnetic resonance imaging showed edema on the biceps muscle and the biopsy of the mass disclosed the presence of severe lymphocyte infiltrate within the connective tissue and scarce muscle fibers. Immunostaining showed positive results for antígeno comun leucocitario in spanish (leukocyte common antigen) (ACL) and CD3. Those results are consistent with the diagnosis of focal myositis. The patient was treated with low doses of prednisone and methotrexate, with good response.
authors.affiliation: Rheumatology Section, José María Cullen Hospital, Av. Freyre 2150, 3000, Santa Fe, Argentina. susanarove@yahoo.com.ar.
authors.forename: Susana
authors.initials: S
authors.lastname: Roverano
authors.affiliation: Rheumatology Section, José María Cullen Hospital, Av. Freyre 2150, 3000, Santa Fe, Argentina.
authors.forename: Alberto
authors.initials: A
authors.lastname: Ortiz
authors.affiliation: Rheumatology Section, José María Cullen Hospital, Av. Freyre 2150, 3000, Santa Fe, Argentina.
authors.forename: Sergio
authors.initials: S
authors.lastname: Paira
mesh_terms: D018951:Antigens, CD20 / Q000378:metabolism; D001132:Arm / Q000473:pathology; D001367:Axillary Vein / Q000473:pathology; D001706:Biopsy; D017252:CD3 Complex / Q000378:metabolism; D016827:CD8 Antigens / Q000378:metabolism; D003937:Diagnosis, Differential; D004487:Edema / Q000175:diagnosis; D005260:Female; D006801:Humans; D008214:Lymphocytes / Q000166:cytology; D008279:Magnetic Resonance Imaging; D008727:Methotrexate / Q000627:therapeutic use; D018482:Muscle, Skeletal / Q000473:pathology; D009220:Myositis / Q000175:diagnosis* / Q000000981:diagnostic imaging; D011241:Prednisone / Q000627:therapeutic use; D013927:Thrombosis / Q000175:diagnosis* / Q000000981:diagnostic imaging; D018608:Ultrasonography, Doppler; D055815:Young Adult
chemical_list: D018951:Antigens, CD20; D017252:CD3 Complex; D016827:CD8 Antigens; D011241:Prednisone; D008727:Methotrexate
keywords: Inflammatory pseudotumor; Myopathy; Solitary mass