title: Ovarian mixed germ cell tumor with yolk sac and teratomatous components in a dog.
abstract: Mixed germ cell tumors of the ovary have rarely been reported in veterinary species. A 3-year-old intact female Labrador Retriever dog was presented for lethargy, abdominal distention, and a midabdominal mass. An exploratory laparotomy revealed a large (23 cm in diameter) left ovarian tumor and multiple small (2-3 cm in diameter) pale tan masses on the peritoneum and abdominal surface of the diaphragm. Histological examination of the left ovary revealed a mixed germ cell tumor with a yolk sac component with rare Schiller-Duval bodies and a teratomatous component comprised primarily of neural differentiation. The abdominal metastases were solely comprised of the yolk sac component. The yolk sac component was diffusely immunopositive for cytokeratin with scattered cells reactive for α-fetoprotein and placental alkaline phosphatase. Within the teratomatous component, the neuropil was diffusely immunopositive for S100, neuron-specific enolase, and neurofilaments with a few glial fibrillary acidic protein immunopositive cells. Ovarian germ cell tumors may be pure and consist of only 1 germ cell element or may be mixed and include more than 1 germ cell element, such as teratoma and yolk sac tumor.
authors.affiliation: Department of Veterinary Population Medicine and Veterinary Diagnostic Laboratory, College of Veterinary Medicine, 244 Veterinary Diagnostic Laboratory, University of Minnesota, 1333 Gortner Avenue, Saint Paul, MN 55108, USA. robin622@umn.edu
authors.forename: Nicholas A
authors.initials: NA
authors.lastname: Robinson
authors.forename: J Carlos
authors.initials: JC
authors.lastname: Manivel
authors.forename: Erik J
authors.initials: EJ
authors.lastname: Olson
mesh_terms: D000818:Animals; D004283:Dog Diseases / Q000473:pathology*; D004285:Dogs; D018240:Endodermal Sinus Tumor / Q000473:pathology / Q000662:veterinary*; D005260:Female; D009373:Neoplasms, Germ Cell and Embryonal / Q000473:pathology / Q000662:veterinary*; D010051:Ovarian Neoplasms / Q000473:pathology*; D013724:Teratoma / Q000473:pathology / Q000662:veterinary*
keywords: Canine; mixed germ cell tumor; ovary; teratomatous component; yolk sac tumor