Hemangiosarcoma of the third eyelid in a dog

Pigatto, João Antonio TadeuAlbuquerque, LucianeVoll, Juliana

Background: Hemangiosarcoma (HSA) is a malignant tumor of vascular endothelial origin. Primary neoplasms are extremely rare in the third eyelid of dogs. Neoplasia affecting ocular surface has been associated with increased exposure to solar radiation. Treatment reported for dogs with conjunctival neoplasia is surgical excision. Definitive diagnosis is confirmed in the histophatological examination. In this report, we describe a case of HSA of the third eyelid in a dog that was successfully treated with surgical excision.Case: A 5-year-old female Boxer dog was referred to the Ophthalmology Section of the Veterinary Clinics Hospital of the Federal University of Rio Grande do Sul (UFRGS), presenting a red mass in the third eyelid of the right eye. Physical examination it was normal except for the ocular disease. The dog had signs of ocular discomfort an epiphora. On ophthalmic examination a fixed, raised, red mass approximately 4 to 5 mm in diameter was identified on the anterior surface of the third eyelid in the right eye. Under general anesthesia, and using an operating microscope the mass was excised with a gross margin and submitted for histopathological analysis. Microscopic examination revealed a lesion composed of neoplastic mesenchymal cells forming irregular channels containing blood. These plump cells showed moderate anisocytosis and anisokaryosis with a low mitotic...(AU)

1. hemangiosarcoma
2. nictitans membrane
3. canine