title: Arrhenoblastoma in a mare.
abstract: An ovarian neoplasm measuring 10 by 8 by 6 cm was surgically removed from a 14-year-old Appaloosa mare. For 2 years prior to surgery, the mare had manifested marked behavioral changes, becoming aggressive toward other broodmares. Histologically, the tumor was found to be an arrhenoblastoma. Preoperative endocrinologic findings (high serum testosterone and low serum estradiol concentrations) supported the diagnosis.
mesh_terms: D000374:Aggression; D000818:Animals; D005260:Female; D006734:Horse Diseases / Q000473:pathology / Q000601:surgery; D006736:Horses; D006801:Humans; D010051:Ovarian Neoplasms / Q000473:pathology / Q000601:surgery / Q000662:veterinary*; D010053:Ovary / Q000473:pathology; D018310:Sertoli-Leydig Cell Tumor / Q000473:pathology / Q000601:surgery / Q000662:veterinary*