{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,12]],"date-time":"2026-07-12T19:22:40Z","timestamp":1783884160203,"version":"3.55.0"},"reference-count":17,"publisher":"BMJ","issue":"9","content-domain":{"domain":["bmj.com"],"crossmark-restriction":true},"short-container-title":["BMJ Case Rep"],"accepted":{"date-parts":[[2025,9,10]]},"published-print":{"date-parts":[[2025,9]]},"abstract":"<jats:p>Acute appendicitis is one of the most common emergency general surgery presentations. However, a duplicate appendix is very rare, in an incidence of 0.004%\u20130.009%\u2009and is challenging to diagnose. It is often diagnosed intraoperatively during laparoscopy or more commonly in laparotomy. A duplicate appendix causing appendicitis can lead to a more complicated presentation, such as perforation. We present a case of a man in his late 70s, who presented with complicated acute appendicitis due to the presence of a double appendix. Both appendices were inflamed, with one having perforated with the presence of a faecolith, leading to an abscess cavity in the right iliac fossa. This case adds to the body of literature on duplicate appendix and emphasises the importance of identifying this anatomical anomaly.<\/jats:p>","DOI":"10.1136\/bcr-2025-265850","type":"journal-article","created":{"date-parts":[[2025,9,22]],"date-time":"2025-09-22T04:25:12Z","timestamp":1758515112000},"page":"e265850","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":1,"title":["Acute appendicitis complicated by a rare double appendix: a rare anatomical anomaly"],"prefix":"10.1136","volume":"18","author":[{"given":"Mohammad","family":"Kasim","sequence":"first","affiliation":[{"name":"Department of Surgery, Hillingdon Hospitals NHS Foundation Trust, Uxbridge, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Byung","family":"Choi","sequence":"additional","affiliation":[{"name":"Department of General Surgery, Hillingdon Hospitals NHS Foundation Trust, Uxbridge, 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