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Given their long lifespan, neoplasia, albeit uncommon, may occur in these animals, and only a few studies have faced their cytological diagnosis. In the present case, a koi carp was referred to the clinicians due to coelomic swelling. The carp underwent surgery, which revealed an enlargement of both testes. Testicular samples were cytologically and histologically examined. The lesion was diagnosed as a seminoma since it was composed of round, large, atypical, and often multinucleated cells with round central nuclei and moderate cytoplasm. These tumors had the same appearance as seminomas in mammals and should be considered among differential diagnoses when coelomic swelling occurs in koi carp. Seminomas in koi carp are diagnosed histologically, but cytology, a rapid and cheap exam executable in all veterinary clinical facilities, could be a relevant preliminary diagnostic tool that may influence the entire diagnostic process.<\/jats:p>","DOI":"10.1007\/s11259-024-10391-3","type":"journal-article","created":{"date-parts":[[2024,5,21]],"date-time":"2024-05-21T02:01:44Z","timestamp":1716256904000},"page":"2589-2593","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Cytology of a seminoma in a koi (Cyprinus carpio): a rapid diagnostic tool"],"prefix":"10.1007","volume":"48","author":[{"given":"Claudio","family":"Pigoli","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gabriele","family":"Ghisleni","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Federico","family":"Armando","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Valeria","family":"Grieco","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Andrea","family":"Ghidelli","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Eleonora","family":"Brambilla","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2024,5,21]]},"reference":[{"issue":"9","key":"10391_CR1","doi-asserted-by":"publisher","first-page":"2621","DOI":"10.3390\/ani1109262","volume":"11","author":"F Armando","year":"2021","unstructured":"Armando F, Pigoli C, Gambini M, Ghidelli A, Ghisleni G, Corradi A, Passeri B, Caniatti M, Grieco V, Baumg\u00e4rtner W, Puff C (2021) Peripheral nerve sheath tumors resembling human atypical neurofibroma in goldfish (Carassius auratus, Linnaeus, 1758). 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