title: Mature teratoma arising from an undescended testis in a horse: comparison between ultrasonographic and morphological features.
abstract: Scant information is available on the ultrasonographic appearance of different testicular tumours in the stallion. Preoperative ultrasound imaging and gross and microscopic features of a testicular teratoma in a horse is described. An asymptomatic 4 years old cryptorchid Arabian horse was admitted for orchiectomy. Combined transabdominal and inguinal ultrasound examination revealed a large complex ovoid mass, containing both solid and cystic elements with internal echoes, located dorsally to the superficial inguinal ring. Two main hypoechoic cavities divided by a linear hyperechoic septum were evident, with a hyperechoic circular structure inside the lumen of the largest one. A tumour of the undescended testis was suspected. Ultrasound findings guided a provisional diagnosis of teratoma that was confirmed by histology following surgical removal of the tumour. Due to the correspondence between ultrasonographic and morphological features, trans-abdominal ultrasonography was conclusive in the preoperative planning.
authors.forename: M P
authors.initials: MP
authors.lastname: Pasolini
authors.forename: G
authors.initials: G
authors.lastname: Della Valle
authors.forename: T B
authors.initials: TB
authors.lastname: Pagano
authors.forename: F
authors.initials: F
authors.lastname: Miele
authors.affiliation: Department of Veterinary Medicine and Animal Productions - University of Napoli Federico II. paciello@unina.it.
authors.forename: O
authors.initials: O
authors.lastname: Paciello
authors.forename: G
authors.initials: G
authors.lastname: Fatone
authors.forename: M
authors.initials: M
authors.lastname: Greco
mesh_terms: D000375:Aging; D000818:Animals; D003456:Cryptorchidism; D006119:Groin; D006734:Horse Diseases; D006736:Horses; D008297:Male; D013724:Teratoma / Q000662:veterinary*; D013736:Testicular Neoplasms / Q000662:veterinary*; D013737:Testis; D014463:Ultrasonography
keywords: cryptorchidism; equine testicular tumour; morphology; ultrasound imaging