Extraosseous osteosarcoma in a maned wolf (Chrysocyon brachyurus)

Area of Science:

• Veterinary Oncology
• Comparative Pathology
• Wildlife Neoplasia

Background:

• Extraosseous osteosarcoma is a rare malignant bone tumor.
• Maned wolves (Chrysocyon brachyurus) are susceptible to various health conditions.
• Understanding neoplasia in exotic species is crucial for conservation and veterinary care.

Observation:

• A 6-year-old maned wolf presented with an extraosseous osteosarcoma on its thigh.
• Radiography showed a calcified mass without skeletal involvement.
• The tumor exhibited rapid regrowth within 5 weeks post-excision.

Findings:

• Histologic examination and p53 immunohistochemistry were performed on the excised tumor.
• The neoplasm was located at a common site for intramuscular injections.
• The maned wolf was euthanized 13 weeks after initial diagnosis.

Implications:

• This case highlights the potential for aggressive extraosseous osteosarcoma in maned wolves.
• The tumor's location raises questions about potential links to injection site reactions, similar to vaccine-associated sarcomas in cats.
• Further research is needed to explore oncogenesis and potential risk factors in exotic carnivores.