Peer-reviewed veterinary case report
Cat develops orbital bone tumor 5 years after eye removal
By Groskopf, Brooke S et al.·Published in Veterinary ophthalmology·2010·Department of Pathobiological Sciences, United States·View original on PubMed →
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Original publication title: Orbital extraskeletal osteosarcoma following enucleation in a cat: a case report.
- Species:
- cat
Plain-English summary
A 7-year-old domestic shorthair cat developed a firm mass and moderate swelling at the site where its left eye had been removed five years earlier due to a cancer called iris melanoma. When the cat was examined, a veterinarian found a cyst and a mass in the area, which were surgically removed. Testing revealed that the mass was an orbital osteosarcoma, a type of bone cancer that can develop from irritation in the tissue. The cat underwent surgery to remove the tumor and cyst, and while the long-term outcome isn't detailed, the surgery was necessary to address the growth.
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Abstract
OBJECTIVE: We present a unique case of a feline orbital extraskeletal osteosarcoma that developed 5 years post-enucleation. HISTORY: In 2002, an ophthalmologist enucleated the left eye of a 2-year-old neutered male DSH and submitted it to the Comparative Ocular Pathology Laboratory of Wisconsin (COPLOW). COPLOW diagnosed the left eye with feline diffuse iris melanoma. In June 2007, the cat presented to another veterinarian for moderate swelling of the enucleation site. Palpation suggested a firm mass along the lateral orbital rim and an exploratory orbitotomy revealed a cyst with a mass adhered to it and the ventrolateral orbital rim. The cyst and mass were excised by the veterinarian and submitted to COPLOW. COPLOW diagnosed the tissue as an orbital conjunctival inclusion cyst and an acquired orbital osteosarcoma. CONCLUSIONS: Following the enucleation, retained conjunctival epithelium became embedded in the connective tissue of the orbit and caused a cyst to develop. The cyst wall consisted of a myofibroblastic collagen-rich matrix and acted as a nidus of chronic irritation and tumor growth. This orbital osteosarcoma resembles feline vaccine-associated sarcomas (VAS), feline post-traumatic ocular sarcomas, and microchip-associated sarcomas in terms of it histopathology and its hypothesized pathogenesis related to exposure to antigenic material such as implanted epithelium, lens protein, vaccine components, and microchips as foreign bodies.
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Search related cases →Original publication on PubMed: https://pubmed.ncbi.nlm.nih.gov/20500718/