Peer-reviewed veterinary case report
Surgical management of a progressive iris melanocytoma in a Mustang.
- Journal:
- Veterinary ophthalmology
- Year:
- 2008
- Authors:
- Scotty, Nicole C et al.
- Affiliation:
- University of Minnesota Veterinary Medical Center · United States
- Species:
- horse
Plain-English summary
A 7-year-old gray Mustang gelding was brought in because he had a brown mass in his left eye that had been growing for about a year. The mass was found to be a nonpainful, vascularized growth in the front part of the eye, and tests confirmed it was a type of tumor called a uveal melanocytic neoplasm. The veterinarians removed the mass through a surgical procedure called sector iridectomy, but they couldn't take out all of the tumor. About a month and a half later, they found some other small skin tumors on the horse, which they removed completely. After 15 months, there was no sign of the eye tumor coming back, indicating that the treatment was successful.
Abstract
CASE DESCRIPTION: A 7-year-old gray Mustang gelding weighing 454 kg was presented for evaluation of a brown mass within the left eye (OS) of 1 year's duration with recent enlargement. CLINICAL FINDINGS: A nonpainful, 8 mm diameter, brown, vascularized mass was identified in the anterior chamber of the OS. Ocular B-scan ultrasound confirmed iris involvement and corneal endothelial contact. Histopathology confirmed the presumptive diagnosis of a uveal melanocytic neoplasm, and revealed 1-3 mitotic figures per high power (400x) field. TREATMENT AND OUTCOME: The mass was removed via sector iridectomy without complications, but without complete margins. Three cutaneous melanocytomas noted 1.5 months postoperatively were completely excised. No tumor regrowth was noted 15 months postoperatively, supporting a diagnosis of melanocytoma for the iridal mass. CLINICAL RELEVANCE: Sector iridectomy is a reasonable treatment option for uncomplicated iridal melanocytomas in horses. Mitotic index and presence of cutaneous melanocytic neoplasms may be irrelevant to the prognosis of equine iridal melanocytic neoplasms.
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Search related cases →Original publication: https://pubmed.ncbi.nlm.nih.gov/18302571/