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Although the diagnosis can be challenging, especially when no lung malignancy is known yet, immunochemistry can be used to differentiate between primary gastrointestinal cancer and lung cancer metastasis.<\/jats:p>","DOI":"10.1136\/bcr-2025-266682","type":"journal-article","created":{"date-parts":[[2025,12,31]],"date-time":"2025-12-31T00:25:14Z","timestamp":1767140714000},"page":"e266682","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":0,"title":["Duodenal metastases from lung adenocarcinoma causing gastrointestinal bleeding: a rare aetiology"],"prefix":"10.1136","volume":"18","author":[{"given":"Nedda","family":"Rahim","sequence":"first","affiliation":[{"name":"Khyber Medical University, Peshawar, N.W.F.P, Pakistan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Gabriela","family":"M\u00e9ndez","sequence":"additional","affiliation":[{"name":"Department of Medicine, University of Illinois Chicago, Chicago, Illinois, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Snehal S","family":"Sonawane","sequence":"additional","affiliation":[{"name":"Department of Pathology, University of Illinois Chicago, Chicago, Illinois, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Asim","family":"Shuja","sequence":"additional","affiliation":[{"name":"Department of Medicine, Division of Gastroenterology and Hepatology, University of Illinois Chicago, Chicago, Illinois, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"239","published-online":{"date-parts":[[2025,12,30]]},"reference":[{"key":"2026010105554156000_18.12.e266682.1","doi-asserted-by":"crossref","first-page":"99","DOI":"10.1055\/s-2007-1018470","article-title":"Gastrointestinal metastases from extra-abdominal tumors","volume":"17","author":"Telerman","year":"1985","journal-title":"Endoscopy"},{"key":"2026010105554156000_18.12.e266682.2","doi-asserted-by":"crossref","first-page":"186","DOI":"10.1159\/000506927","article-title":"A Rare Presentation of Poorly Differentiated Lung Carcinoma with Duodenal Metastasis and Literature Review","volume":"14","author":"Ahmed","year":"2020","journal-title":"Case Rep Gastroenterol"},{"key":"2026010105554156000_18.12.e266682.3","doi-asserted-by":"publisher","DOI":"10.1016\/j.lungcan.2006.08.007"},{"key":"2026010105554156000_18.12.e266682.4","doi-asserted-by":"crossref","DOI":"10.14309\/crj.0000000000001474","article-title":"Upper Gastrointestinal Bleeding Due to Metastatic Lung Adenocarcinoma in the Stomach and Duodenum","volume":"11","author":"Arif","year":"2024","journal-title":"ACG Case Rep J"},{"key":"2026010105554156000_18.12.e266682.5","doi-asserted-by":"crossref","DOI":"10.1097\/MD.0000000000040058","article-title":"Gastric and small bowel metastases from lung adenocarcinoma: A case report","volume":"103","author":"Wang","year":"2024","journal-title":"Medicine (Baltimore)"},{"key":"2026010105554156000_18.12.e266682.6","doi-asserted-by":"crossref","first-page":"1282","DOI":"10.3748\/wjg.v13.i8.1282","article-title":"Melena: a rare complication of duodenal metastases from primary carcinoma of the lung","volume":"13","author":"Kostakou","year":"2007","journal-title":"World J Gastroenterol"},{"key":"2026010105554156000_18.12.e266682.7","doi-asserted-by":"crossref","first-page":"6135","DOI":"10.1016\/j.radcr.2024.08.161","article-title":"Duodenal metastasis from primary lung adenocarcinoma: A rare case report","volume":"19","author":"El Houssni","year":"2024","journal-title":"Radiol Case Rep"},{"key":"2026010105554156000_18.12.e266682.8","doi-asserted-by":"publisher","DOI":"10.1056\/NEJMoa2004407"}],"container-title":["BMJ Case Reports"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/syndication.highwire.org\/content\/doi\/10.1136\/bcr-2025-266682","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,1,1]],"date-time":"2026-01-01T13:55:47Z","timestamp":1767275747000},"score":1,"resource":{"primary":{"URL":"https:\/\/casereports.bmj.com\/lookup\/doi\/10.1136\/bcr-2025-266682"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2025,12]]},"references-count":8,"journal-issue":{"issue":"12","published-online":{"date-parts":[[2025,12,30]]},"published-print":{"date-parts":[[2025,12]]}},"alternative-id":["10.1136\/bcr-2025-266682"],"URL":"https:\/\/doi.org\/10.1136\/bcr-2025-266682","relation":{},"ISSN":["1757-790X"],"issn-type":[{"type":"electronic","value":"1757-790X"}],"subject":[],"published":{"date-parts":[[2025,12]]}}}