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  • Title: Mast cell tumor invading the cornea in a horse.
    Author: Halse S, Pizzirani S, Parry NM, Burgess KE.
    Journal: Vet Ophthalmol; 2014 May; 17(3):221-7. PubMed ID: 23905672.
    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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