Peer-reviewed veterinary case report
Horse has a reddish mass on eye - what could it be?
By Halse, Stacey et al.·Published in Veterinary ophthalmology·2014·Department of Clinical Sciences, United States·View original on PubMed →
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Original publication title: Mast cell tumor invading the cornea in a horse.
- Species:
- horse
Plain-English summary
A 3-year-old Marwari mare had a reddish, irregular growth coming from behind her right eyelid. This mass was found to be invading the area around her cornea, but no other health issues were noted at the time. The growth was surgically removed, and a special laser treatment was used to help the healing process. A follow-up two months later showed that the area was healing well, and after 32 months, there was no sign of the tumor coming back.
Abstract
A 3-year-old Marwari mare was presented for evaluation of an irregular, reddish mass protruding from behind the right third eyelid. The mass appeared to arise at the ventral limbal area, involved the perilimbal bulbar conjunctiva and widely extended into corneal tissue. No other ocular or systemic abnormalities were detected at the time of presentation. The mass was surgically removed by lamellar keratectomy, with defocused CO(2) laser used as adjunctive therapy to treat the surgical exposed area and its surroundings. Histopathologic evaluation showed sheets of densely packed, well-differentiated neoplastic mast cells separated by fibrovascular connective tissue. Nuclear staining for Ki-67 was performed, and an average of 370 cells were positive per 1000 counted cells. Two months postoperatively, the surgical site was filled with flat fibrovascular and pigmented tissue, while the surrounding cornea was transparent with no superficial vascularization around the fibrotic scar. Thirty-two months after treatment, no recurrence of the neoplasia was reported.
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Search related cases →Original publication on PubMed: https://pubmed.ncbi.nlm.nih.gov/23905672/