title: Nephroblastoma with transcoelomic metastasis in a Japanese black bull.
abstract: This paper describes a nephroblastoma with transcoelomic metastasis in a three-year-old Japanese black bull. At necropsy, a huge, oval neoplastic mass containing the residual right kidney was found. Moreover, severe transcoelomic metastasis occurred throughout the abdominal and thoracic cavities. Histologically, the mass was mainly composed of sheets, nests, islands and cords of polygonal blastemal cells with trabeculae of fibrous stroma. In some areas, epithelial elements composed of tubules and winding duct-like structures were also observed. Glomeruloid structures were scattered in these epithelial elements. Metastatic nodules were composed of blastemal and stromal elements, which were similar to those in the mass.
authors.affiliation: National Institute of Animal Health, Kannondai, Tsukuba, Ibaraki, Japan.
authors.forename: Yu
authors.initials: Y
authors.lastname: Yamamoto
authors.forename: Manabu
authors.initials: M
authors.lastname: Yamada
authors.forename: Kikuyasu
authors.initials: K
authors.lastname: Nakamura
authors.forename: Yuji
authors.initials: Y
authors.lastname: Takahashi
authors.forename: Toru
authors.initials: T
authors.lastname: Miyamoto
mesh_terms: D000008:Abdominal Neoplasms / Q000556:secondary / Q000662:veterinary*; D000818:Animals; D002417:Cattle; D002418:Cattle Diseases / Q000473:pathology*; D007680:Kidney Neoplasms / Q000473:pathology / Q000662:veterinary*; D008297:Male; D009396:Wilms Tumor / Q000473:pathology / Q000662:veterinary*