{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,8,2]],"date-time":"2025-08-02T14:52:05Z","timestamp":1754146325272,"version":"3.41.2"},"reference-count":20,"publisher":"Wiley","issue":"1","license":[{"start":{"date-parts":[[2025,1,2]],"date-time":"2025-01-02T00:00:00Z","timestamp":1735776000000},"content-version":"vor","delay-in-days":1,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Clinical Case Reports"],"published-print":{"date-parts":[[2025,1]]},"abstract":"<jats:title>ABSTRACT<\/jats:title><jats:p>Blunt abdominal trauma causing intraperitoneal injury and\/or bleeding can be life\u2010threatening, requiring immediate intervention. Diagnosing these cases can be challenging, especially when pre\u2010existing conditions are involved. Low\u2010grade appendiceal mucinous neoplasm (LAMN) is a rare tumor of the appendix that can lead to pseudomyxoma peritonei. Herein, we present a case of ruptured LAMN following blunt abdominal trauma after a high\u2010energy head\u2010on collision, complicating the differentiation from other intraperitoneal injuries. A 42\u2010year\u2010old Japanese female was brought to our hospital following high\u2010energy head\u2010on collision. She presented with stable vital signs, complaining of anterior chest pain and abdominal tenderness without peritoneal irritation. Computed tomography scans indicated multiple fractures in her chest and complex fluid around the Douglas fossa extending to the ileocecal area, with a slightly dilated appendix tip. Despite stable vitals, emergency laparotomy was needed for suspected peritonitis and\/or intraperitoneal hemorrhage. Emergency laparotomy revealed yellowish, jelly\u2010like ascites and a ruptured appendiceal tumor. LAMN was suspected, and the appendix was completely resected, with cytoreductive surgery carefully performed. Histopathological examination confirmed the diagnosis of LAMN. Postoperative course was uneventful, and the patient was discharged on Day 13 and referred for further LAMN management. This case report highlights the diagnostic difficulties of LAMN rupture following blunt abdominal trauma, stressing the need to consider rare conditions like LAMN in differential diagnoses of acute abdomen posttrauma.<\/jats:p>","DOI":"10.1002\/ccr3.70071","type":"journal-article","created":{"date-parts":[[2025,1,2]],"date-time":"2025-01-02T23:10:04Z","timestamp":1735859404000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Undetermined Ruptured Low\u2010Grade Appendiceal Mucinous Neoplasm Following High\u2010Energy Blunt Abdominal Trauma Requiring Emergency Laparotomy"],"prefix":"10.1002","volume":"13","author":[{"given":"Ippei","family":"Matsuo","sequence":"first","affiliation":[{"name":"Department of Emergency, Critical Care, and Disaster Medicine, Faculty of Medicine, Dentistry, and Pharmaceutical Sciences Okayama University  Okayama Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1766-8026","authenticated-orcid":false,"given":"Tetsuya","family":"Yumoto","sequence":"additional","affiliation":[{"name":"Department of Emergency, Critical Care, and Disaster Medicine, Faculty of Medicine, Dentistry, and Pharmaceutical Sciences Okayama University  Okayama Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Akari","family":"Tsuji","sequence":"additional","affiliation":[{"name":"Department of Emergency, Critical Care, and Disaster Medicine, Faculty of Medicine, Dentistry, and Pharmaceutical Sciences Okayama University  Okayama Japan"},{"name":"Center for Graduate Medical Education Okayama University Hospital  Okayama Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ryo","family":"Tanabe","sequence":"additional","affiliation":[{"name":"Department of Emergency, Critical Care, and Disaster Medicine, Faculty of Medicine, Dentistry, and Pharmaceutical Sciences Okayama University  Okayama Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Toshihisa","family":"Matsumura","sequence":"additional","affiliation":[{"name":"Department of Digestive Surgery Japanese Red Cross Okayama Hospital  Okayama Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mikoto","family":"Shimabara","sequence":"additional","affiliation":[{"name":"Department of Digestive Surgery Japanese Red Cross Okayama Hospital  Okayama Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Masaaki","family":"Akai","sequence":"additional","affiliation":[{"name":"Department of Digestive Surgery Japanese Red Cross Okayama Hospital  Okayama Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Shoji","family":"Takagi","sequence":"additional","affiliation":[{"name":"Department of Digestive Surgery Japanese Red Cross Okayama Hospital  Okayama 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