Osteosarcoma in cats: 22 cases (1974-1984)

Area of Science:

• Veterinary Oncology
• Comparative Pathology
• Feline Medicine

Background:

• Osteosarcoma is a primary bone tumor that can affect various skeletal sites in domestic animals.
• Feline osteosarcoma is relatively rare, and its clinical characteristics and prognostic factors require further elucidation.

Purpose of the Study:

• To investigate the clinical features, radiographic appearance, and treatment outcomes of osteosarcoma in cats.
• To compare the prognosis of appendicular versus axial osteosarcoma in felines.
• To evaluate the efficacy of amputation as a treatment modality for feline appendicular osteosarcoma.

Main Methods:

• Retrospective case series of 22 cats diagnosed with osteosarcoma.
• Review of physical, radiographic, and histologic findings.
• Analysis of treatment methods (amputation, euthanasia) and survival times.

Main Results:

• Fifteen appendicular, 4 skull, 2 pelvic, and 1 rib osteosarcomas were identified.
• Appendicular tumors were predominantly lytic with a "moth-eaten" appearance; axial tumors showed lysis and periosteal new bone formation.
• Cats with appendicular osteosarcoma treated with amputation had a significantly better median survival time (49.2 months) compared to those with axial osteosarcoma (5.5 months).
• 33% of cats with appendicular osteosarcoma survived for 5 years or longer after diagnosis and treatment.

Conclusions:

• Appendicular osteosarcoma in cats carries a more favorable prognosis than axial osteosarcoma.
• Amputation is a viable and effective treatment for feline appendicular osteosarcoma, significantly improving long-term survival.
• Early diagnosis and appropriate surgical intervention are crucial for optimizing outcomes in cats with appendicular osteosarcoma.