Peer-reviewed veterinary case report
Dark eye tumor causing pupil dilation in an older cat
By Semin, Marie O et al.·Published in Veterinary ophthalmology·2011·Department of Clinical Sciences, France·View original on PubMed →
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Original publication title: Choroidal melanocytoma in a cat.
- Species:
- cat
Plain-English summary
An 11-year-old male neutered European cat was brought in because one of his eyes was larger than the other (anisocoria) due to pupillary dilation. The vet found a dark, raised mass in the affected eye, which was causing retinal detachment. After confirming the mass was a tumor and not spreading elsewhere in the body, the vet removed the eye. The tumor was identified as a choroidal melanocytoma, which is a type of eye tumor that is not cancerous. Unfortunately, the cat passed away five months later from unrelated kidney cancer, and there was no sign that the eye tumor had spread.
People also search for: cat eye problems · anisocoria in cats · choroidal melanocytoma treatment · cat eye tumor symptoms · cat kidney cancer signs
Abstract
An 11-year-old male, neutered European cat was presented for anisocoria due to pupillary dilation in the right eye. Ophthalmic findings were restricted to this eye and consisted of a raised, darkly pigmented, retrolental mass associated with retinal detachment. Ultrasonography identified the mass lesion protruding into the vitreous cavity from the posterior pole of the eyeball and confirmed the detachment of the retina. A tentative diagnosis of an intraocular tumor was made. Radiographic evaluation and retromandibular lymph node cytology did not reveal evidence of distant metastasis. Orbital exenteration of the affected eye was performed and the tumor was diagnosed as a choroidal melanocytic tumor with no criteria of malignancy (melanocytoma). The cat died 5 months later from renal lymphoma, and necropsy did not detect metastasis of the melanocytic tumor. To our knowledge this is the first reported case of feline choroidal melanocytoma.
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Search related cases →Original publication on PubMed: https://pubmed.ncbi.nlm.nih.gov/21521446/