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These 2 cases, together with the recently reported case of PG and B27\u2010positive psoriatic spondylarthropathy, suggest that PG may also occur in association with forms of seronegative SpA that are different from primary ankylosing spondylitis (AS) and AS associated with inflammatory bowel disease.<\/jats:p>","DOI":"10.1002\/art.1780390627","type":"journal-article","created":{"date-parts":[[2007,2,14]],"date-time":"2007-02-14T11:40:11Z","timestamp":1171453211000},"page":"1062-1065","source":"Crossref","is-referenced-by-count":14,"title":["Pyoderma gangrenosum in association with undifferentiated seronegative spondylarthropathy"],"prefix":"10.1002","volume":"39","author":[{"given":"Ignazio","family":"Olivieri","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Angela Maria","family":"Costa","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Fabrizio","family":"Cantini","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Laura","family":"Niccoli","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Raffaela","family":"Marini","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Silvio","family":"Ferri","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2005,12,12]]},"reference":[{"key":"e_1_2_1_2_2","first-page":"173","article-title":"Pyoderma gangrenosum: a review of 86 patients","volume":"55","author":"Powell FC","year":"1985","journal-title":"QJM"},{"key":"e_1_2_1_3_2","doi-asserted-by":"publisher","DOI":"10.1097\/00005792-198003000-00003"},{"key":"e_1_2_1_4_2","doi-asserted-by":"crossref","first-page":"57","DOI":"10.1001\/archderm.1989.01670130059007","article-title":"Present status of pyoderma gangrenosum: review of 21 cases","volume":"125","author":"Prystowsky JH","year":"1989","journal-title":"Arch Dermatol"},{"key":"e_1_2_1_5_2","first-page":"137","article-title":"Pyoderma gangrenosum et pelvispondylite sans maladie intestinale patente: a propos d'un cas","volume":"54","author":"Le Goff P","year":"1987","journal-title":"Rev Rhum Mal Osteoartic"},{"key":"e_1_2_1_6_2","doi-asserted-by":"publisher","DOI":"10.1002\/art.1780370823"},{"key":"e_1_2_1_7_2","first-page":"85","article-title":"Criteres de classification des spondylarthropathies","volume":"57","author":"Amor B","year":"1990","journal-title":"Rev Rhum Mal Osteoartic"},{"key":"e_1_2_1_8_2","doi-asserted-by":"publisher","DOI":"10.1002\/art.1780341003"},{"key":"e_1_2_1_9_2","doi-asserted-by":"publisher","DOI":"10.1016\/0049-0172(90)90023-9"},{"key":"e_1_2_1_10_2","doi-asserted-by":"crossref","first-page":"187","DOI":"10.1016\/S0889-857X(21)00717-1","article-title":"Undifferentiated spondylo\u2010arthropathies","volume":"18","author":"Zeidler H","year":"1992","journal-title":"Reum Dis Clin North Am"},{"key":"e_1_2_1_11_2","first-page":"899","article-title":"Late onset undifferentiated seronegative spondyloarthropathy","volume":"22","author":"Olivieri I","year":"1995","journal-title":"J Rheumatol"},{"key":"e_1_2_1_12_2","first-page":"526","article-title":"Clinical features and followup study of HLA\u2010B27 positive patients presenting with peripheral arthritis","volume":"12","author":"Sambrook P","year":"1985","journal-title":"J Rheumatol"},{"key":"e_1_2_1_13_2","first-page":"976","article-title":"HLA\u2010B27 associated dactylitis in children","volume":"15","author":"Siegel DM","year":"1988","journal-title":"J Rheumatol"},{"key":"e_1_2_1_14_2","first-page":"164","article-title":"Longstanding isolated juvenile onset HLA\u2010B27 associated peripheral enthesitis","volume":"19","author":"Olivieri I","year":"1992","journal-title":"J Rheumatol"},{"key":"e_1_2_1_15_2","doi-asserted-by":"publisher","DOI":"10.1002\/art.1780280107"},{"key":"e_1_2_1_16_2","first-page":"836","article-title":"Chest pain without radiographic sacroiliitis in relatives of patients with ankylosing spondylitis","volume":"15","author":"Van der Linden SM","year":"1988","journal-title":"J Rheumatol"},{"key":"e_1_2_1_17_2","first-page":"678","article-title":"Prevalence rates of spondy\u2010loarthopathies, rheumatoid arthritis, and other rheumatic disorders in an Alaskan Inupiat Eskimo population","volume":"15","author":"Boyer GS","year":"1988","journal-title":"J Rheumatol"},{"key":"e_1_2_1_18_2","first-page":"489","article-title":"Spondyloarthropathy and rheumatoid arthritis in Alaskan Yupik Eskimos","volume":"17","author":"Boyer GS","year":"1990","journal-title":"J Rheumatol"},{"key":"e_1_2_1_19_2","first-page":"2292","article-title":"Prevalence of spondyloarthropathies in Alaskan Eskimos","volume":"21","author":"Boyer GS","year":"1994","journal-title":"J Rheumatol"}],"container-title":["Arthritis &amp; 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