title: Osteosarcoma in a cow.
abstract: A mass involving the maxilla of a cow was determined to be an osteosarcoma. Microscopically, the mass was composed of plump pyriform cells aligned along thin trabeculae of osteoid. Osteosarcoma rarely develops in large animal species, but when it does, it is usually found in the skull and must be differentiated from more common diseases, such as actinomycosis and tooth abscesses.
authors.affiliation: Department of Veterinary Clinical Sciences, Veterinary Teaching Hospital, College of Veterinary Medicine, Iowa State University, Ames 50011.
authors.forename: K H
authors.initials: KH
authors.lastname: Plumlee
authors.forename: J S
authors.initials: JS
authors.lastname: Haynes
authors.forename: K W
authors.initials: KW
authors.lastname: Kersting
authors.forename: J R
authors.initials: JR
authors.lastname: Thompson
mesh_terms: D000818:Animals; D001707:Biopsy, Needle / Q000662:veterinary; D002417:Cattle; D002418:Cattle Diseases / Q000473:pathology*; D005260:Female; D008441:Maxillary Neoplasms / Q000473:pathology / Q000662:veterinary*; D012516:Osteosarcoma / Q000473:pathology / Q000662:veterinary*; D011247:Pregnancy; D011252:Pregnancy Complications, Neoplastic / Q000473:pathology / Q000662:veterinary*