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Ultrasonography, computed tomography (CT) and magnetic resonance imaging (MRI) can provide more information about the internal organs and pathognomic lesions. The authors used diagnostic imaging techniques to evaluate and describe the neoplastic malformation in a 3\u2010year\u2010old female rainbow trout (<jats:italic>Oncorhynchus mykiss<\/jats:italic>). The fish was examined with Siemens Somatom Definition AS + CT scanner and Siemens Biograph mMR scanner. The animal was lethargic and showed anorectic signs and muscular dystrophy. During the post\u2010mortem investigation, histopathology and immunohistochemistry were also performed allowing us to identify the neoplasms. The results showed a large soft tissue mass in the first mid\u2010intestine segment, which proved to be an adenocarcinoma. This subsequently led to digestion problems and absorption disorders. Immunohistochemically, neoplastic cells of carcinoma revealed E\u2010cadherin and pancytokeratin positivity. This is the first study to report the use of MRI and CT for studying gastrointestinal adenocarcinoma in rainbow trout.<\/jats:p>","DOI":"10.1111\/jfd.13951","type":"journal-article","created":{"date-parts":[[2024,4,8]],"date-time":"2024-04-08T09:59:40Z","timestamp":1712570380000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Rainbow trout (<i>Oncorhynchus mykiss<\/i>, Walbaum 1792) adenocarcinoma investigation with various diagnostic imaging techniques"],"prefix":"10.1111","volume":"47","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0354-1892","authenticated-orcid":false,"given":"M\u00e1rton","family":"Hoitsy","sequence":"first","affiliation":[{"name":"Department of Exotic Animal and Wildlife Medicine and Clinic University of Veterinary Medicine  Budapest Hungary"},{"name":"Budapest Zoo and Botanical Garden  Budapest Hungary"},{"name":"Vet4Fish Kft  Szada 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