title: Zygomatic osteoma with atypical heterogeneity in a dog.
abstract: An osteoma of the zygomatic bone in a young dog is described. It had large, centralized radiolucent regions consisting of fatty bone marrow and sparse trabeculae. A discrete, proliferative nodule within the osteoma consisted of closely-packed woven bone trabeculae and pleomorphic osteoblasts associated with haphazard osteoid deposits, resembling osteosarcoma-like change. These heterogeneous structural features were at variance with more classic reports of osteoma, which usually describe a uniform cancellous or cortical bone architecture.
authors.affiliation: Department of Surgical Sciences, University of Wisconsin-Madison, USA.
authors.forename: K A
authors.initials: KA
authors.lastname: Johnson
authors.forename: A J
authors.initials: AJ
authors.lastname: Cooley
authors.forename: D L
authors.initials: DL
authors.lastname: Darien
mesh_terms: D000818:Animals; D004283:Dog Diseases / Q000473:pathology*; D004285:Dogs; D005153:Facial Neoplasms / Q000000981:diagnostic imaging / Q000473:pathology* / Q000662:veterinary*; D008297:Male; D010016:Osteoma / Q000000981:diagnostic imaging / Q000473:pathology* / Q000662:veterinary*; D011859:Radiography; D015050:Zygoma / Q000000981:diagnostic imaging / Q000473:pathology*