title: A case of umbilical cord teratoma in an aborted foal.
abstract: A 16-year-old primiparous mare aborted an apparently normal fetus at 240 days of gestation. A large, oval mass, measuring approximately 20 cm × 30 cm × 20 cm, was detected attached to the umbilical cord of the fetus. On the cut surface, the mass showed multifocal cystic structures, foci of mineralization, and diffuse hemorrhages. Histological examination of the mass revealed haphazardly arranged cartilage, bone, mesenchymal stroma, adipose tissue, vascular structures, smooth muscle, ciliated epithelium, squamous cornifying epithelium, and undifferentiated germ cells with areas of necrosis and mineralization. The mass was diagnosed as an umbilical cord teratoma, which is an extremely rare tumor in human beings and, to the authors' knowledge, has only described in the veterinary literature on one occasion.
authors.affiliation: Department of Veterinary Science and Public Health, Faculty of Veterinary Medicine, Veterinary University Hospital-Pathology Unit, Università degli Studi di Milano, 26900, Lodi, Italy. diana.binanti@unimi.it
authors.forename: Diana
authors.initials: D
authors.lastname: Binanti
authors.forename: Marco
authors.initials: M
authors.lastname: Livini
authors.forename: Pietro
authors.initials: P
authors.lastname: Riccaboni
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Sironi
mesh_terms: D037881:Aborted Fetus / Q000473:pathology*; D000818:Animals; D017809:Fatal Outcome; D005260:Female; D006651:Histocytochemistry / Q000662:veterinary; D006734:Horse Diseases / Q000473:pathology*; D006736:Horses; D008297:Male; D011247:Pregnancy; D013724:Teratoma / Q000473:pathology / Q000662:veterinary*; D014470:Umbilical Cord / Q000473:pathology*