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Intermandibular malignant mesenchymoma in a crossbreed dog.

S Murphy¹, A S Blunden, R Dennis

¹Animal Health Trust, Lanwades Park, Kentford, Suffolk.

The Journal of Small Animal Practice

|September 12, 2006

Summary

A German Shepherd dog with a submandibular mass, initially diagnosed as myxosarcoma, was reclassified as malignant mesenchymoma. Despite surgery and adjuvant therapy, the dog developed widespread metastases.

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Area of Science:

Veterinary Oncology
Comparative Pathology

Background:

A 12-year-old German Shepherd presented with a submandibular mass.
Initial diagnosis was myxosarcoma via incisional biopsy.

Observation:

Staging via chest radiographs and MRI for surgical planning.
Debulking surgery was performed.

Findings:

Histopathology reclassified the tumor as malignant mesenchymoma with myxosarcomatous and osteosarcomatous differentiation.
The dog received adjuvant radiotherapy and carboplatin chemotherapy.
No local recurrence was noted postmortem, but distant metastases were present in the thorax and abdomen.

Implications:

Highlights the importance of accurate histopathological diagnosis for treatment planning in canine tumors.
Demonstrates the challenges in managing aggressive mesenchymal tumors in dogs.
Suggests potential for systemic spread even after local tumor control.