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Renal osteosarcoma in a dog.

J S Munday1, J Egins, B A Selcer

  • 1Department of Pathobiology, Institute of Veterinary and Animal Biological Sciences, Massey University, Private Bag 11 222, Palmerston North, New Zealand.

The Journal of Small Animal Practice
|December 17, 2004
PubMed
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A dog with renal osteosarcoma experienced local tumor recurrence despite initial surgical success. Hematuria indicated both initial tumor development and its later recurrence, leading to euthanasia.

Area of Science:

  • Veterinary Oncology
  • Canine Pathology

Background:

  • Osteosarcoma is a common bone cancer in dogs, often affecting long bones but can occur in other sites.
  • Primary renal osteosarcoma is rare in dogs, presenting diagnostic and therapeutic challenges.

Observation:

  • A seven-and-a-half-year-old dog presented with anorexia, lethargy, and hematuria.
  • A large abdominal mass (1.8 kg) was surgically removed and diagnosed as primary renal osteosarcoma.

Findings:

  • The dog experienced local tumor recurrence five months post-surgery, confirmed radiographically.
  • The recurrence manifested as hematuria, a sign also present during initial tumor development.
  • Despite expectations of distant metastasis for osteosarcomas, this case was characterized by local recurrence.

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Implications:

  • This case highlights the potential for local recurrence of renal osteosarcoma in dogs.
  • Hematuria can be a critical indicator for both the initial diagnosis and subsequent recurrence of renal tumors.
  • Management strategies for rare canine osteosarcomas should consider the possibility of local recurrence even after apparent complete resection.