title: Malignant mixed mullerian tumor in a rabbit (Oryctolagus cuniculus): case report with immunohistochemistry.
abstract: A rabbit (Oryctolagus cuniculus) with a homologous malignant mixed müllerian tumor (MMMT) of the uterus with decidualization in the sarcomatous components is described. On histologic examination, the neoplasm was characterized by a carcinomatous and a sarcomatous component with invasion of the myometrium. The epithelial component was a well-differentiated carcinoma, and the nonepithelial component contained large amounts of intracytoplasmic glycogen. The changes in stromal cells were morphologically similar to changes usually found in decidual cells in the pregnant uterus or in deciduosarcomas in rabbits. Results of immunohistochemical analysis indicated that the epithelial components stained positive with cytokeratin (CK7, AE1/3) and the decidual-stromal cells stained positive for vimentin, but did not stain with alpha-SMA, actin, and desmin. This case fulfills all the criteria of an MMMT in having a carcinomatous and a sarcomatous component, but differs from cases of MMMT in women in that the sarcomatous component had decidualized. To the authors' knowledge, this is the first report of a malignant mixed müllerian tumor in rabbits.
authors.affiliation: Laboratory of Veterinary Pathology, School of Veterinary Medicine, Azabu University 1-17-71 Fuchinobe Sagamihara, Kanagawa 229-8501 (Japan). usalove52@hotmail.com
authors.forename: M
authors.initials: M
authors.lastname: Goto
authors.forename: Y
authors.initials: Y
authors.lastname: Nomura
authors.forename: Y
authors.initials: Y
authors.lastname: Une
authors.forename: M H
authors.initials: MH
authors.lastname: Goldschmidt
mesh_terms: D000818:Animals; D005260:Female; D007150:Immunohistochemistry / Q000662:veterinary; D018200:Mixed Tumor, Mullerian / Q000473:pathology / Q000601:surgery / Q000662:veterinary*; D011817:Rabbits; D014594:Uterine Neoplasms / Q000473:pathology / Q000601:surgery / Q000662:veterinary*