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It most frequently affects the dorsal tongue. Gingival involvement is extremely rare, with only nine cases documented in the English\u2010language literature. This report describes a 20\u2010year\u2010old woman who presented with a well\u2010circumscribed, painless, firm, and sessile nodule on the buccal gingiva of the left posterior mandible. Panoramic radiography revealed no pathological alterations. The initial clinical impression was fibroma. Surgical excision was performed. Histopathology revealed well\u2010demarcated nodules of mature lamellar bone within a fibrous stroma, confirming the diagnosis of osseous choristoma. No recurrence was detected at the 6\u2010month follow\u2010up. This case constitutes the tenth reported instance of gingival osseous choristoma. A review of the nine previous cases is also provided to enhance diagnostic precision and clarify clinicopathologic features.<\/jats:p>","DOI":"10.1155\/crid\/9494235","type":"journal-article","created":{"date-parts":[[2026,4,29]],"date-time":"2026-04-29T07:39:18Z","timestamp":1777448358000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["A Rare Case of Gingival Osseous Choristoma Misdiagnosed as Fibroma"],"prefix":"10.1155","volume":"2026","author":[{"ORCID":"https:\/\/orcid.org\/0009-0004-1375-8176","authenticated-orcid":false,"given":"Yilin","family":"Wang","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0002-5942-4652","authenticated-orcid":false,"given":"Chu","family":"Xu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8648-7136","authenticated-orcid":false,"given":"Ting","family":"Chen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,4,29]]},"reference":[{"key":"e_1_2_12_1_2","doi-asserted-by":"publisher","DOI":"10.1007\/s12105-020-01251-y"},{"key":"e_1_2_12_2_2","volume-title":"Oral and Maxillofacial Pathology","author":"Neville B. 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