{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,20]],"date-time":"2026-05-20T02:58:16Z","timestamp":1779245896298,"version":"3.51.4"},"reference-count":22,"publisher":"Termedia Sp. z.o.o.","issue":"5","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Reumatologia"],"published-print":{"date-parts":[[2015,10,30]]},"abstract":"<jats:p>Rheumatoid arthritis (RA) and ankylosing spondylitis (AS) are chronic progressive inflammatory diseases, leading to joint damage and reducing the physical fitness of patients. They are among the most common rheumatic diseases. However, their etiology and symptomatology are different. Formerly, AS was often wrongly diagnosed as RA. Today there are no major diagnostic difficulties in differentiation between these diseases, thanks to modern laboratory tests and imaging. However, a problem may arise when the patient has symptoms typical for both diseases simultaneously. Cases of coexistence of RA with AS \u2013 according to our best knowledge \u2013 are rare. This study aims to compare our experience in diagnosis and treatment of concomitant RA and AS with the experience of other researchers. Implementation of the proper diagnostic algorithm, allowing for correct diagnosis of both diseases in one patient, may be useful for differential diagnosis of similar cases in the future.<\/jats:p>","DOI":"10.5114\/reum.2015.55832","type":"journal-article","created":{"date-parts":[[2016,3,22]],"date-time":"2016-03-22T08:44:45Z","timestamp":1458636285000},"page":"279-285","source":"Crossref","is-referenced-by-count":25,"title":["Coexistence of rheumatoid arthritis and ankylosing spondylitis"],"prefix":"10.5114","volume":"53","author":[{"given":"Tacjana Anna","family":"Barczy\u0144ska","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ma\u0142gorzata","family":"W\u0119gierska","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Pawe\u0142","family":"\u017buchowski","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Marta","family":"Dura","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Joanna","family":"Zalewska","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Marzena","family":"Waszczak","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"S\u0142awomir","family":"Jeka","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"3061","published-online":{"date-parts":[[2015,12,8]]},"reference":[{"key":"ref-798108","unstructured":"Maksymowych WP, Brown MA. 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Czynniki predysponuj\u0105ce do wyst\u0105pienia zmian zapalnych i rozwoju niestabilno\u015bci kr\u0119gos\u0142upa szyjnego u chorych na reumatoidalne zapalenie staw\u00f3w. Reumatologia 2006; 44: 34-40."},{"key":"ref-798121","unstructured":"Wilson D. Rheumatoid factors in patients with rheumatoid arthritis. Can Fam Physician 2006; 52: 180-181."},{"key":"ref-798122","doi-asserted-by":"crossref","unstructured":"Mart\u00ednez-Cordero E, L\u00f3pez-Zepeda J, Fonseca MC. Rheumatoid arthritis associated with ankylosing spondylitis defined by scintigraphic and CT abnormalities. Clin Rheumatol 1992; 11: 574-577.","DOI":"10.1007\/BF02283124"},{"key":"ref-798123","doi-asserted-by":"crossref","unstructured":"Chen J, Veras MM, Liu C, et al. Methotrexate for ankylosing spondylitis. Cochrane Database Syst Rev 2013; 2: CD004524.","DOI":"10.1002\/14651858.CD004524.pub4"},{"key":"ref-798124","doi-asserted-by":"crossref","unstructured":"Baksay B, D\u00e9r A, Szekanecz Z, et al. 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