{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,1]],"date-time":"2026-09-01T17:14:40Z","timestamp":1788282880058,"version":"build-2803163510"},"reference-count":15,"publisher":"Oxford University Press (OUP)","issue":"7","license":[{"start":{"date-parts":[[2026,7,30]],"date-time":"2026-07-30T00:00:00Z","timestamp":1785369600000},"content-version":"vor","delay-in-days":29,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2026,7,4]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>High-grade appendiceal mucinous neoplasm is an extremely rare gastrointestinal tumour with nonspecific clinical manifestations that complicate preoperative diagnosis. In women, it may mimic gynecological diseases, particularly ovarian tumours, leading to diagnostic delays and inappropriate surgical approaches. We report the case of a 68-year-old woman from the San Mart\u00edn region of Peru who presented with abdominal pain, progressive distension, and abnormal vaginal bleeding. Laboratory tests showed elevated carcinoembryonic antigen levels, while transvaginal ultrasound revealed a right adnexal mass suggestive of ovarian neoplasia. During surgery, a mucinous appendiceal mass without ovarian involvement was incidentally identified, prompting modification of the surgical plan to an oncological right hemicolectomy. Histopathological analysis confirmed high-grade mucinous adenocarcinoma of the appendix. The postoperative course was favorable. This case highlights the importance of considering appendiceal neoplasms in the differential diagnosis of pelvic masses in postmenopausal women and the value of intraoperative and histopathological evaluation.<\/jats:p>","DOI":"10.1093\/jscr\/rjag649","type":"journal-article","created":{"date-parts":[[2026,7,10]],"date-time":"2026-07-10T11:51:57Z","timestamp":1783684317000},"source":"Crossref","is-referenced-by-count":0,"title":["High-grade appendiceal mucinous neoplasm: case report"],"prefix":"10.1093","volume":"2026","author":[{"ORCID":"https:\/\/orcid.org\/0009-0008-6100-2356","authenticated-orcid":false,"given":"Julio Caleb","family":"Arrieta Navarro","sequence":"first","affiliation":[{"name":"Faculty of Human Medicine, National University of San Mart\u00edn , Tarapoto ,","place":["Peru"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3207-2255","authenticated-orcid":false,"given":"Julio Erick","family":"Leiva Valderrama","sequence":"additional","affiliation":[{"name":"Faculty of Human Medicine, National University of San Mart\u00edn , Tarapoto ,","place":["Peru"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9658-2890","authenticated-orcid":false,"given":"Sergio Daniel","family":"Coral Salvador","sequence":"additional","affiliation":[{"name":"Faculty of Human Medicine, National University of San Mart\u00edn , Tarapoto ,","place":["Peru"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8930-3416","authenticated-orcid":false,"given":"Nicole Karina","family":"Escudero Navarro","sequence":"additional","affiliation":[{"name":"Faculty of Human Medicine, National University of San Mart\u00edn , Tarapoto ,","place":["Peru"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0001-3743-2443","authenticated-orcid":false,"given":"Alan Hari","family":"Silva 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