{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,11,1]],"date-time":"2026-11-01T01:20:03Z","timestamp":1793496003879,"version":"4.5.0"},"reference-count":13,"publisher":"Springer Science and Business Media LLC","issue":"1","license":[{"start":{"date-parts":[[2023,10,30]],"date-time":"2023-10-30T00:00:00Z","timestamp":1698624000000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0"},{"start":{"date-parts":[[2023,10,30]],"date-time":"2023-10-30T00:00:00Z","timestamp":1698624000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0"}],"content-domain":{"domain":["link.springer.com"],"crossmark-restriction":false},"short-container-title":["surg case rep"],"abstract":"<jats:title>Abstract<\/jats:title><jats:sec>\n                <jats:title>Background<\/jats:title>\n                <jats:p>This case report highlights the exceptional rarity of appendix duplication in adults, a condition that closely mimics appendiceal tumors, posing diagnostic challenges. The novelty of this case lies in its presentation of a Type A duplication, emphasizing the diagnostic intricacies involved in distinguishing it from other pathologies.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Case presentation<\/jats:title>\n                <jats:p>We present the case of a 69-year-old male with a history of hypertension, hyperuricemia, and duodenal gastric ulcer, who presented with a positive occult blood test. Lower gastrointestinal endoscopy revealed an appendiceal orifice with atypical hyperemia and edema. Subsequent imaging and biopsy results suggested an appendiceal tumor, prompting laparoscopic ileocecal resection. Intraoperative findings revealed an unremarkable appendix, but histopathological analysis unveiled appendiceal duplication, characterized by bifurcation into two lumens within a thick serosal wall. The patient was discharged without complications.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Conclusions<\/jats:title>\n                <jats:p>This case underscores the importance of recognizing appendix duplication as a rare differential diagnosis for appendiceal tumors. Surgeons should remain vigilant, especially in cases of Type A duplication, where preoperative diagnosis remains challenging. Early identification can avert potential complications and missed congenital anomalies.<\/jats:p>\n              <\/jats:sec>","DOI":"10.1186\/s40792-023-01769-7","type":"journal-article","created":{"date-parts":[[2023,10,30]],"date-time":"2023-10-30T06:02:13Z","timestamp":1698645733000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Duplication of the appendix masquerading as appendiceal tumor: a case report"],"prefix":"10.1186","volume":"9","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7817-1614","authenticated-orcid":false,"given":"Jumpei","family":"Shibata","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4696-991X","authenticated-orcid":false,"given":"Akihiro","family":"Tomida","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Masaoki","family":"Hattori","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Akihiro","family":"Hirata","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hiromitsu","family":"Imataki","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yukiya","family":"Orihara","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hideharu","family":"Shintomi","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Keiya","family":"Aono","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Motoi","family":"Yoshihara","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2023,10,30]]},"reference":[{"key":"1769_CR1","doi-asserted-by":"publisher","first-page":"1063","DOI":"10.1148\/radiographics.13.5.8210590","volume":"13","author":"RI Macpherson","year":"1993","unstructured":"Macpherson RI. Gastrointestinal tract duplications: clinical, pathologic, etiologic, and radiologic considerations. Radiographics. 1993;13:1063\u201380.","journal-title":"Radiographics"},{"key":"1769_CR2","first-page":"437","volume":"101","author":"DC Collins","year":"1955","unstructured":"Collins DC. A study of 50,000 specimens of the human vermiform appendix. Surg Gynecol Obstet. 1955;101:437\u201345.","journal-title":"Surg Gynecol Obstet"},{"key":"1769_CR3","first-page":"1259","volume":"83","author":"KT Kjossev","year":"1996","unstructured":"Kjossev KT, Losanoff JE. Duplicated vermiform appendix. Br J Surg. 1996;83:1259.","journal-title":"Br J Surg"},{"issue":"122","key":"1769_CR4","first-page":"817","volume":"1987","author":"MK Bluett","year":"1960","unstructured":"Bluett MK, Halter SA, Salhany KE, O\u2019Leary JP. Duplication of the appendix mimicking adenocarcinoma of the colon. Arch Surg Chic Ill. 1960;1987(122):817\u201320.","journal-title":"Arch Surg Chic Ill"},{"key":"1769_CR5","doi-asserted-by":"publisher","first-page":"1267","DOI":"10.1016\/0022-3468(95)90482-4","volume":"30","author":"CP Iyer","year":"1995","unstructured":"Iyer CP, Mahour GH. Duplications of the alimentary tract in infants and children. J Pediatr Surg. 1995;30:1267\u201370.","journal-title":"J Pediatr Surg"},{"key":"1769_CR6","first-page":"283","volume":"70","author":"AJE Cave","year":"1936","unstructured":"Cave AJE. Appendix vermiformis duplex. J Anat. 1936;70:283\u201392.","journal-title":"J Anat"},{"key":"1769_CR7","doi-asserted-by":"publisher","first-page":"346","DOI":"10.1002\/bjs.18005022124","volume":"50","author":"PH Wallbridge","year":"1962","unstructured":"Wallbridge PH. Double appendix. BJS. Br J Surg. 1962;50:346\u20137.","journal-title":"Br J Surg"},{"key":"1769_CR8","first-page":"1059","volume":"64","author":"R Biermann","year":"1993","unstructured":"Biermann R, Borsk\u00fd D, Gogora M. Double appendicitis\u2014a rare pathologic entity. Chir Z Alle Geb Oper Medizen. 1993;64:1059\u201361.","journal-title":"Chir Z Alle Geb Oper Medizen."},{"key":"1769_CR9","doi-asserted-by":"publisher","first-page":"574","DOI":"10.1007\/s00268-017-4178-1","volume":"42","author":"H Nageswaran","year":"2018","unstructured":"Nageswaran H, Khan U, Hill F, Maw A. Appendiceal duplication: a comprehensive review of published cases and clinical recommendations. World J Surg. 2018;42:574\u201381.","journal-title":"World J Surg"},{"key":"1769_CR10","doi-asserted-by":"publisher","first-page":"559","DOI":"10.1016\/j.ijscr.2012.08.004","volume":"3","author":"G Christodoulidis","year":"2012","unstructured":"Christodoulidis G, Symeonidis D, Spyridakis M, Koukoulis G, Manolakis A, Triantafylidis G, et al. Acute appendicitis in a duplicated appendix. Int J Surg Case Rep. 2012;3:559\u201362.","journal-title":"Int J Surg Case Rep"},{"key":"1769_CR11","doi-asserted-by":"publisher","first-page":"668","DOI":"10.1007\/s11605-008-0774-6","volume":"13","author":"AN Trivedi","year":"2009","unstructured":"Trivedi AN, Levine EA, Mishra G. Adenocarcinoma of the appendix is rarely detected by colonoscopy. J Gastrointest Surg. 2009;13:668\u201375.","journal-title":"J Gastrointest Surg"},{"key":"1769_CR12","doi-asserted-by":"publisher","first-page":"452","DOI":"10.1016\/j.gie.2005.04.018","volume":"62","author":"SA Zanati","year":"2005","unstructured":"Zanati SA, Martin JA, Baker JP, Streutker CJ, Marcon NE. Colonoscopic diagnosis of mucocele of the appendix. Gastrointest Endosc. 2005;62:452\u20136.","journal-title":"Gastrointest Endosc"},{"key":"1769_CR13","doi-asserted-by":"publisher","first-page":"279","DOI":"10.1016\/j.jcol.2019.04.003","volume":"39","author":"EDPL Vieira","year":"2019","unstructured":"Vieira EDPL, Bonato LM, Silva GGPD, Gurgel JL. Congenital abnormalities and anatomical variations of the vermiform appendix and mesoappendix. J Coloproctology. 2019;39:279\u201387.","journal-title":"J Coloproctology"}],"container-title":["Surgical Case Reports"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/link.springer.com\/content\/pdf\/10.1186\/s40792-023-01769-7.pdf","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/link.springer.com\/article\/10.1186\/s40792-023-01769-7\/fulltext.html","content-type":"text\/html","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/link.springer.com\/content\/pdf\/10.1186\/s40792-023-01769-7.pdf","content-type":"application\/pdf","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2023,10,30]],"date-time":"2023-10-30T06:03:53Z","timestamp":1698645833000},"score":1,"resource":{"primary":{"URL":"https:\/\/surgicalcasereports.springeropen.com\/articles\/10.1186\/s40792-023-01769-7"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2023,10,30]]},"references-count":13,"journal-issue":{"issue":"1","published-online":{"date-parts":[[2023,12]]}},"alternative-id":["1769"],"URL":"https:\/\/doi.org\/10.1186\/s40792-023-01769-7","relation":{},"ISSN":["2198-7793"],"issn-type":[{"value":"2198-7793","type":"electronic"}],"subject":[],"published":{"date-parts":[[2023,10,30]]},"assertion":[{"value":"1 October 2023","order":1,"name":"received","label":"Received","group":{"name":"ArticleHistory","label":"Article History"}},{"value":"17 October 2023","order":2,"name":"accepted","label":"Accepted","group":{"name":"ArticleHistory","label":"Article History"}},{"value":"30 October 2023","order":3,"name":"first_online","label":"First Online","group":{"name":"ArticleHistory","label":"Article History"}},{"order":1,"name":"Ethics","group":{"name":"EthicsHeading","label":"Declarations"}},{"value":"Any accompanying images and the procedures followed were in accordance with the Declaration of Helsinki. Our internal ethics committee does not need its reference for a case report publication. The need for approval was waived.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethics approval and consent to participate"}},{"value":"Written informed consent was obtained from the patient for publication of this case report. A copy of the written consent is available for review from the editor of this journal.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Consent for publication"}},{"value":"The authors declare that they have no competing interests.","order":4,"name":"Ethics","group":{"name":"EthicsHeading","label":"Competing interests"}}],"article-number":"190"}}