A malignant nephroblastoma in an aged fox (Fennecus zerda)

Area of Science:

• Veterinary Pathology
• Comparative Oncology

Background:

• Nephroblastomas are rare in Canidae, typically affecting young animals.
• This report details a nephroblastoma in an aged fox, an unusual presentation.

Observation:

• A malignant nephroblastoma with pulmonary metastasis was identified post-mortem in an elderly fox.
• This represents the first documented instance of such a tumor in a fox.

Findings:

• The tumor's presence in an aged animal raises questions regarding its origin and behavior.
• Potential complications included congestive heart failure due to pulmonary metastasis.

Implications:

• The tumor may have induced polycythemia via erythropoietin or increased peripheral resistance through the renin-angiotensin system.
• This case highlights the importance of considering rare tumor presentations in aged animals.