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Histologically, a neoplasm effaced and\/or compressed residual thymic parenchyma and consisted of ill-defined aggregates of 2\u20133 primordial germ cell lineages (ectoderm, mesoderm, endoderm). Immunohistochemical and histochemical stains, including desmin, glial fibrillary acidic protein, pancytokeratin, and phosphotungstic acid hematoxylin, confirmed the presence of heterogeneous germ cell tissues, consistent with an extragonadal teratoma. Extragonadal teratomas are rare in non-human species, particularly in avian species, and reports of mediastinal involvement are limited. In our case, the teratoma was an incidental finding; the primary reason for submission was progressive necroulcerative bacterial dermatitis affecting the right leg.<\/jats:p>","DOI":"10.1177\/10406387261477349","type":"journal-article","created":{"date-parts":[[2026,8,30]],"date-time":"2026-08-30T03:21:55Z","timestamp":1788060115000},"page":"1272-1276","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":0,"title":["Thymic teratoma in a chicken and a literature review of gonadal and extragonadal teratomas in veterinary species"],"prefix":"10.1177","volume":"38","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4897-7358","authenticated-orcid":false,"given":"Macallister C.","family":"Harris","sequence":"first","affiliation":[{"name":"Department of Microbiology, Immunology and Pathology, Colorado State University, Fort Collins, CO, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chad B.","family":"Frank","sequence":"additional","affiliation":[{"name":"Department of Microbiology, Immunology and Pathology, Colorado State University, Fort Collins, CO, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"179","published-online":{"date-parts":[[2026,8,29]]},"reference":[{"key":"e_1_3_3_2_2","first-page":"6710","article-title":"Ovarian teratogenic neoplasm in canine","volume":"23","author":"Alves JEO","year":"2018","unstructured":"Alves JEO, et al. 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