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Open Access Spontaneous Osteoblastic Osteosarcoma in a Mongolian Gerbil (Meriones unguiculatus)

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Spontaneous neoplasms in Mongolian gerbils have an incidence of 20% to 26.8%, but osteosarcomas occur at a much lower rate. Here we report a 1-y-old Mongolian gerbil with a spontaneous osteosarcoma at the level of the proximal tibia, with metastases to the pectoral muscles and lungs. Grossly, the tibial mass obliterated the tibia and adjacent muscles, and an axillary mass with a bloody, cavitary center expanded the pectoral muscles. Microscopically, the tibial mass was an infiltrative, osteoblastic mesenchymal neoplasm, and the axillary mass was an anaplastic mesenchymal neoplasm with hemorrhage. The lung contained multiple metastatic foci. Immunohistochemistry for osteonectin was strongly positive in the tibial, axillary, and pulmonary metastases. Although osteosarcoma is the most common primary malignant bone neoplasm that occurs spontaneously in all laboratory and domestic animal species and humans, it arises less frequently than does other neoplasms. The current case of spontaneous osteoblastic osteosarcoma of the proximal tibia and metastases to the pectoral muscles and lung in a Mongolian gerbil is similar in presentation, histology, and predilection site of both osteoblastic and telangiectatic osteosarcomas in humans. In addition, this case is an unusual manifestation of osteosarcoma in the appendicular skeleton of a Mongolian gerbil.
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Document Type: Case Report

Affiliations: 1: University Research Animal Resources, University of Georgia, Athens, Georgia, USA; California National Primate Research Center, University of California–Davis, Davis, California, USA 2: Georgia Laboratory Animal Diagnostic Services, Athens Veterinary Diagnostic Laboratory, Department of Pathology, College of Veterinary Medicine, University of Georgia, Athens, Georgia, USA. [email protected] 3: Department of Pathology, Oncology Drug Discovery, Abbott Laboratories, Lake Bluff, Illinois, USA 4: University Research Animal Resources, Department of Population Health, College of Veterinary Medicine, University of Georgia, Athens, Georgia, USA 5: Department of Pathology, College of Veterinary Medicine, University of Georgia, Athens, Georgia, USA

Publication date: 2013-02-01

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  • Comparative Medicine (CM), an international journal of comparative and experimental medicine, is the leading English-language publication in the field and is ranked by the Science Citation Index in the upper third of all scientific journals. The mission of CM is to disseminate high-quality, peer-reviewed information that expands biomedical knowledge and promotes human and animal health through the study of laboratory animal disease, animal models of disease, and basic biologic mechanisms related to disease in people and animals.

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