{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,3]],"date-time":"2026-07-03T23:51:37Z","timestamp":1783122697691,"version":"3.54.6"},"reference-count":12,"publisher":"SAGE Publications","issue":"2_suppl","license":[{"start":{"date-parts":[[2023,11,22]],"date-time":"2023-11-22T00:00:00Z","timestamp":1700611200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by-nc\/4.0\/"},{"start":{"date-parts":[[2023,11,22]],"date-time":"2023-11-22T00:00:00Z","timestamp":1700611200000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/journals.sagepub.com\/page\/policies\/text-and-data-mining-license"}],"content-domain":{"domain":["journals.sagepub.com"],"crossmark-restriction":true},"short-container-title":["Ear Nose Throat J"],"published-print":{"date-parts":[[2025,11]]},"abstract":"<jats:p>A 45-year-old man presented with a history of chronic left nasal congestion. Nasal endoscopy revealed a pedunculated polypoid mass with glandular epithelium surface on the posterior nasal septum. Computed tomography revealed a 25-mm mass-like growth in the left posterior nasal cavity attached to the nasal septum with a stalk. The patient underwent transnasal endoscopic surgery, and the tumor was removed under a block with safety margin. The final pathological diagnosis was sinonasal seromucinous hamartoma (SH). Sinonasal SH is a rare tumor with only 31 reported cases. Transnasal endoscopic surgery is currently the first-line treatment for sinonasal SH. Differential diagnoses of this lesion include inflammatory polyps, respiratory epithelial adenomatoid hamartoma, and adenocarcinoma. Although SH is a benign tumor, its progression to adenocarcinoma has been reported. Therefore, unilateral posterior nasal tumors must be diagnosed precisely.<\/jats:p>","DOI":"10.1177\/01455613231213496","type":"journal-article","created":{"date-parts":[[2023,11,22]],"date-time":"2023-11-22T07:38:15Z","timestamp":1700638695000},"update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":2,"title":["A Rare Case of Sinonasal Seromucinous Hamartoma Developing from the Nasal Septum"],"prefix":"10.1177","volume":"104","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6196-4215","authenticated-orcid":false,"given":"Shin","family":"Ito","sequence":"first","affiliation":[{"name":"Department of Otorhinolaryngology\u2013Head and Neck Surgery, Juntendo University Urayasu Hospital, Chiba, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Takuma","family":"Ide","sequence":"additional","affiliation":[{"name":"Department of Otorhinolaryngology\u2013Head and Neck Surgery, Juntendo University Urayasu Hospital, Chiba, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kazuma","family":"Ishikawa","sequence":"additional","affiliation":[{"name":"Department of Otorhinolaryngology\u2013Head and Neck Surgery, Juntendo University Urayasu Hospital, Chiba, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Akane","family":"Hashizume","sequence":"additional","affiliation":[{"name":"Department of Pathology, Juntendo University Urayasu Hospital, Chiba, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0802-8011","authenticated-orcid":false,"given":"Fumihiko","family":"Matsumoto","sequence":"additional","affiliation":[{"name":"Department of Otorhinolaryngology, Juntendo University Faculty of Medicine, Tokyo, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ryuzaburo","family":"Higo","sequence":"additional","affiliation":[{"name":"Department of Otorhinolaryngology\u2013Head and Neck Surgery, Juntendo University Urayasu Hospital, Chiba, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"179","published-online":{"date-parts":[[2023,11,22]]},"reference":[{"key":"e_1_3_3_2_2","volume-title":"WHO Classification of Head and Neck Tumors","author":"El-Nagger AK","unstructured":"El-Nagger AK, Chan JKC, Grandis JR, et al. 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