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Case Report: Metastatic Parosteal Osteosarcoma in a Dog
Sarah K Samuels1, Matthew R Cook1, Eric Green1
1Department of Veterinary Clinical Sciences, The Ohio State University, Columbus, OH, United States.
Frontiers in Veterinary Science
|September 10, 2021
Summary
This case report details a rare canine parosteal osteosarcoma (POSA) with lung metastasis. Treatment involved surgery, radiation, and amputation, highlighting advanced imaging and therapeutic approaches for this bone tumor.
Area of Science:
- Veterinary Oncology
- Comparative Pathology
- Medical Imaging in Animals
Background:
- Parosteal osteosarcoma (POSA) is a rare malignant bone tumor.
- Appendicular POSA in dogs is exceptionally uncommon, with limited documented cases.
- Metastatic potential of canine POSA requires further investigation.
Observation:
- An 8-year-old Labrador retriever presented with a distal humeral mass and pulmonary nodule.
- Radiographs and computed tomography (CT) revealed a mineralized humeral lesion and a lung nodule.
- Histopathology confirmed parosteal osteosarcoma (POSA) in both primary and metastatic sites.
Findings:
- This is the first report detailing CT imaging characteristics of metastatic appendicular POSA in a dog.
- The case describes the use of stereotactic body radiation therapy (SBRT) for canine POSA management.
- The patient survived 623 days post-diagnosis with pulmonary metastatic disease.
Implications:
- CT imaging provides valuable insights into the presentation of canine POSA.
- SBRT shows potential as a treatment modality for managing discomfort associated with canine POSA.
- This case expands the understanding of POSA's behavior and treatment outcomes in veterinary medicine.
