{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,8,28]],"date-time":"2025-08-28T05:40:07Z","timestamp":1756359607546,"version":"3.44.0"},"reference-count":10,"publisher":"BMJ","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["BMJ Case Reports"],"abstract":"<jats:p>We describe the case of a 45-year-old man with ankylosing spondylitis being treated with etanercept who presented with a 1\u2005month history of abdominal pain. CT abdomen revealed an ileocaecal mass associated with an abscess, resulting in a laparotomy and right hemi-colectomy. Histology of the resected specimen showed the classical features of Crohn's disease. Etanercept was stopped and he was started on adalimumab. He is currently in clinical remission from both ankylosing spondylitis and Crohn's disease.<\/jats:p>","DOI":"10.1136\/bcr-2013-009166","type":"journal-article","created":{"date-parts":[[2013,6,28]],"date-time":"2013-06-28T11:42:19Z","timestamp":1372419739000},"page":"bcr2013009166","source":"Crossref","is-referenced-by-count":4,"title":["Crohn's disease unmasked following etanercept treatment for ankylosing spondylitis"],"prefix":"10.1136","volume":"2013","author":[{"given":"H","family":"Jethwa","sequence":"first","affiliation":[{"name":"NHS, London, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"S","family":"Mann","sequence":"additional","affiliation":[{"name":"NHS, London, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"239","published-online":{"date-parts":[[2013,6,21]]},"reference":[{"key":"2025082722153675000_2013.jun21_1.bcr2013009166.1","doi-asserted-by":"crossref","first-page":"176","DOI":"10.1016\/j.semarthrit.2008.06.004","article-title":"Emergence of Crohn's disease during treatment with the anti-tumor necrosis factor agent etanercept for ankylosing spondylitis: possible mechanisms of action","volume":"2013","author":"Haraoui","year":"2009","journal-title":"Semin Arthritis Rheum"},{"key":"2025082722153675000_2013.jun21_1.bcr2013009166.2","unstructured":"Womeldorph C Goldkind L . Etanercept and inflammatory bowel disease: friend or foe. In: American College of Gastroenterology. No. 538, 69th Annual meeting of the American College of Gastroenterology, Orlando, FA, 31 October\u20133 November 2004, USA. London: Blackwell Publishing, 2004."},{"key":"2025082722153675000_2013.jun21_1.bcr2013009166.3","doi-asserted-by":"crossref","first-page":"342","DOI":"10.1093\/rheumatology\/keh475","article-title":"Long-term efficacy and safety of etanercept after readministration in patients with active ankylosing spondylitis","volume":"2013","author":"Brandt","year":"2005","journal-title":"Rheumatology"},{"key":"2025082722153675000_2013.jun21_1.bcr2013009166.4","doi-asserted-by":"crossref","first-page":"3230","DOI":"10.1002\/art.11325","article-title":"Recombinant human tumor necrosis factor receptor (etanercept) for treating ankylosing spondylitis: a randomized, controlled trial","volume":"2013","author":"Davis","year":"2003","journal-title":"Arthritis Rheum"},{"key":"2025082722153675000_2013.jun21_1.bcr2013009166.5","first-page":"532","article-title":"New onset of Crohn's disease during treatment of active ankylosing spondylitis with etanercept","volume":"2013","author":"Song","year":"2008","journal-title":"J Rheum"},{"key":"2025082722153675000_2013.jun21_1.bcr2013009166.6","first-page":"94","article-title":"Severe peri-anal Crohn's disease developing while on etanercept for ankylosing spondylitis","volume":"2013","author":"Bashyam","year":"2012","journal-title":"Gastroenterol Today"},{"key":"2025082722153675000_2013.jun21_1.bcr2013009166.7","doi-asserted-by":"crossref","first-page":"1088","DOI":"10.1053\/gast.2001.28674","article-title":"Etanercept for active Crohn's disease: a randomized, double-blind, placebo-controlled trial","volume":"2013","author":"Sandborn","year":"2001","journal-title":"Gastroenterology"},{"key":"2025082722153675000_2013.jun21_1.bcr2013009166.8","doi-asserted-by":"crossref","first-page":"451","DOI":"10.1016\/j.berh.2006.03.010","article-title":"Ankylosing spondylitis and bowel disease","volume":"2013","author":"Rudwaleit","year":"2006","journal-title":"Best Pract Res Clin Rheumatol"},{"key":"2025082722153675000_2013.jun21_1.bcr2013009166.9","first-page":"752","article-title":"Development of Crohn's disease in a patient taking etanercept","volume":"2013","author":"Oh","year":"2005","journal-title":"J Rheumatol"},{"key":"2025082722153675000_2013.jun21_1.bcr2013009166.10","doi-asserted-by":"crossref","first-page":"801","DOI":"10.1007\/s00296-009-0991-7","article-title":"Crohn's disease during etanercept therapy in juvenile idiopathic arthritis: a case report and review of the literature","volume":"2013","author":"Wiegering","year":"2010","journal-title":"Rheumatol Int"}],"container-title":["BMJ Case Reports"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/syndication.highwire.org\/content\/doi\/10.1136\/bcr-2013-009166","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,8,28]],"date-time":"2025-08-28T05:15:46Z","timestamp":1756358146000},"score":1,"resource":{"primary":{"URL":"https:\/\/casereports.bmj.com\/lookup\/doi\/10.1136\/bcr-2013-009166"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2013,6,21]]},"references-count":10,"alternative-id":["10.1136\/bcr-2013-009166"],"URL":"https:\/\/doi.org\/10.1136\/bcr-2013-009166","relation":{},"ISSN":["1757-790X"],"issn-type":[{"type":"electronic","value":"1757-790X"}],"subject":[],"published":{"date-parts":[[2013,6,21]]}}}