NEVPC 2022

Signalment:18-year-old American Quarter horse gelding.

History:The patient presented to Comparative Ophthalmology at Auburn University of College of Veterinary Medicine in July 2021 with swelling and epiphora of the left eye for the past two weeks. Clinical examination revealed exophthalmos in the left eye with chemosis and periorbital swelling. The head CT showed an approximately 4.5-cm diameter mass in the left retrobulbar space with attenuation similar to soft tissue. The mass extended into the ethmoid turbinates and eroded the left aspect of the cribriform plate. Euthanasia was elected due to the poor prognosis.

Gross Lesions:The left eye was markedly enlarged and bulged from the orbit. An approximately 4-cm x 5-cm x 4.5-cm well-demarcated, multinodular, tan, and firm mass was present in the left retrobulbar space. The neoplasm compressed the left eyeball, invaded the left medial orbital wall, and infiltrated and effaced the medial aspect of the left ethmoid turbinates. The mass was tan and multilobulated on the cut surface.