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Equine osteosarcoma: a series of 8 cases
J M Bush1, R L Fredrickson, E J Ehrhart
1Colorado State University, Department of Microbiology, Immunology, and Pathology, 1619 Campus Delivery, Fort Collins, CO 80523-1619, USA. Jamie.Bush@ColoState.edu
Veterinary Pathology
|February 24, 2007
Summary
Equine osteosarcoma, a rare bone cancer in horses, most often affects the head. This study details 8 cases, finding older male horses predominantly affected, with no metastasis observed.
Area of Science:
- Veterinary Oncology
- Equine Medicine
- Skeletal Tumors
Background:
- Osteosarcoma is a rare malignant bone tumor in horses.
- Most equine osteosarcoma cases occur in the head, particularly the mandible, often in young horses.
Purpose of the Study:
- To document clinical findings and outcomes of equine osteosarcoma cases.
- To report the first case of equine extraosseous osteosarcoma.
Main Methods:
- Retrospective case series of 8 equine osteosarcoma patients.
- Histopathological classification of tumor subtypes.
- Review of surgical treatment and patient outcomes.
Main Results:
- Majority of cases occurred in male horses aged 7+ years.
- Tumors primarily located in the maxilla or mandible (6/7), with one in the tibia.
- Fibroblastic osteosarcoma was the predominant subtype; no metastasis was identified.
- First report of equine extraosseous osteosarcoma with successful surgical excision and no recurrence at 14 months.
Conclusions:
- Equine osteosarcoma typically affects older male horses and lacks metastasis.
- Surgical excision is a primary treatment, but complete removal can be challenging.
- Further research into equine osteosarcoma treatments, including chemotherapy, is needed.
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