{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,8,27]],"date-time":"2025-08-27T06:40:05Z","timestamp":1756276805709,"version":"3.44.0"},"reference-count":12,"publisher":"BMJ","content-domain":{"domain":["bmj.com"],"crossmark-restriction":true},"short-container-title":["BMJ Case Reports"],"accepted":{"date-parts":[[2017,4,27]]},"abstract":"<jats:p>Duodenal polypoid masses are an uncommon finding mainly diagnosed incidentally at endoscopy or surgery. We report a 39-year-old female patient with symptoms of intermittent stabbing pain in the upper right abdominal quadrant and an iron deficiency anaemia, without complaints of weight loss, haematemesis or melaena. A duodenal polyp and acute duodenitis have been described during endoscopic examinations and CT and ultrasound. Surgical excision of the polyp was advised. Intraoperatively, an elongated duodenum was remarkable; however, at duodenotomy, no polyp was found, nor during intraoperative endoscopy. Looking back at the endoscopy and imaging results, it was noted that the polyp varied in size and location. It was therefore concluded that we dealt with the pseudopolyp phenomenon, caused by invagination of the duodenal wall and its mesentery into the duodenum, presenting as a lipomatous pseudopolyp. Telescopic invagination of the duodenal wall was facilitated by the elongated hypermobile duodenum.<\/jats:p>","DOI":"10.1136\/bcr-2016-214998","type":"journal-article","created":{"date-parts":[[2017,5,13]],"date-time":"2017-05-13T03:25:15Z","timestamp":1494645915000},"page":"bcr-2016-214998","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":2,"title":["The vanishing duodenal polyp: mesenteric invagination presenting as duodenal pseudopolyp"],"prefix":"10.1136","volume":"2017","author":[{"given":"Bernadette S","family":"de Bakker","sequence":"first","affiliation":[{"name":"Division of Anatomy, Embryology and Physiology, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Saffire S K S","family":"Phoa","sequence":"additional","affiliation":[{"name":"Division of Radiology, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mohammed","family":"Kara","sequence":"additional","affiliation":[{"name":"Department of Gastroenterology, MC Zuiderzee, Lelystad, The Netherlands"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sabaa","family":"Al-Eryani","sequence":"additional","affiliation":[{"name":"Department of Gastroenterology, MC Zuiderzee, Lelystad, The Netherlands"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Marieke E","family":"Gielen","sequence":"additional","affiliation":[{"name":"Division of Gastroenterology, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Cyriel I J","family":"Ponsioen","sequence":"additional","affiliation":[{"name":"Division of Gastroenterology, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Henri M","family":"de Bakker","sequence":"additional","affiliation":[{"name":"Department of Radiology, Groene Hart Hospital, Gouda, The Netherlands"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Thomas M","family":"van Gulik","sequence":"additional","affiliation":[{"name":"Division of Surgery, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"239","published-online":{"date-parts":[[2017,5,13]]},"reference":[{"key":"2025082623222100000_2017.may12_5.bcr-2016-214998.1","doi-asserted-by":"crossref","first-page":"154","DOI":"10.1055\/s-2007-1018163","article-title":"Giant brunneroma of the duodenum","volume":"20","author":"B\u00e4stlein","year":"1988","journal-title":"Endoscopy"},{"issue":"Suppl 1","key":"2025082623222100000_2017.may12_5.bcr-2016-214998.2","doi-asserted-by":"crossref","DOI":"10.1055\/s-2006-945153","article-title":"Endoscopic removal of giant Brunneroma presenting as a large pedunculated polyp","volume":"39","author":"Kim","year":"2007","journal-title":"Endoscopy"},{"key":"2025082623222100000_2017.may12_5.bcr-2016-214998.3","doi-asserted-by":"crossref","first-page":"910","DOI":"10.1007\/s005950200179","article-title":"Giant Brunneroma as an unusual cause of upper gastrointestinal hemorrhage: report of a case","volume":"32","author":"Tan","year":"2002","journal-title":"Surg Today"},{"key":"2025082623222100000_2017.may12_5.bcr-2016-214998.4","doi-asserted-by":"crossref","first-page":"260","DOI":"10.1159\/000235236","article-title":"Dual transoral endoscopic resection of a symptomatic giant brunneroma","volume":"3","author":"Sulz","year":"2009","journal-title":"Case Rep Gastroenterol"},{"key":"2025082623222100000_2017.may12_5.bcr-2016-214998.5","doi-asserted-by":"crossref","first-page":"262","DOI":"10.2214\/ajr.123.2.262","article-title":"Duodenal pseudopolyp-the flexure fallacy","volume":"123","author":"Nelson","year":"1975","journal-title":"Am J Roentgenol Radium Ther Nucl Med"},{"key":"2025082623222100000_2017.may12_5.bcr-2016-214998.6","doi-asserted-by":"crossref","first-page":"183","DOI":"10.1159\/000327219","article-title":"An unusual cause of gastrointestinal bleeding: duodenal lipoma","volume":"5","author":"Kadaba","year":"2011","journal-title":"Case Rep Gastroenterol"},{"key":"2025082623222100000_2017.may12_5.bcr-2016-214998.7","first-page":"598","article-title":"Lipoma of the alimentary tract","volume":"53","author":"Mayo","year":"1963","journal-title":"Surgery"},{"key":"2025082623222100000_2017.may12_5.bcr-2016-214998.8","doi-asserted-by":"crossref","first-page":"316","DOI":"10.1111\/j.1440-1746.2005.03787.x","article-title":"Images of interest. gastrointestinal: duodenal pseudopolyp","volume":"20","author":"Lyburn","year":"2005","journal-title":"J Gastroenterol Hepatol"},{"key":"2025082623222100000_2017.may12_5.bcr-2016-214998.9","doi-asserted-by":"publisher","DOI":"10.1177\/0036933013519028"},{"key":"2025082623222100000_2017.may12_5.bcr-2016-214998.10","first-page":"78","article-title":"A Peutz-Jeghers syndrome case with iron deficiency Anemia and jejuno-jejunal invagination","volume":"14","author":"S\u00f6kmen","year":"2003","journal-title":"Turk J Gastroenterol"},{"key":"2025082623222100000_2017.may12_5.bcr-2016-214998.11","doi-asserted-by":"crossref","first-page":"675","DOI":"10.1016\/S0929-693X(03)00340-3","article-title":"[Clinical radiology case. acute intestinal invagination with mesenteric lymphadenopathy]","volume":"10","author":"Quelquejay","year":"2003","journal-title":"Arch Pediatr"},{"key":"2025082623222100000_2017.may12_5.bcr-2016-214998.12","doi-asserted-by":"publisher","DOI":"10.1055\/s-2008-1043851"}],"container-title":["BMJ Case Reports"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/syndication.highwire.org\/content\/doi\/10.1136\/bcr-2016-214998","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,8,27]],"date-time":"2025-08-27T06:22:33Z","timestamp":1756275753000},"score":1,"resource":{"primary":{"URL":"https:\/\/casereports.bmj.com\/lookup\/doi\/10.1136\/bcr-2016-214998"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2017,5,13]]},"references-count":12,"alternative-id":["10.1136\/bcr-2016-214998"],"URL":"https:\/\/doi.org\/10.1136\/bcr-2016-214998","relation":{},"ISSN":["1757-790X"],"issn-type":[{"type":"electronic","value":"1757-790X"}],"subject":[],"published":{"date-parts":[[2017,5,13]]}}}