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摘要

An 8-year-old gray Irish Sport Horse gelding was referred for investigation of ongoing signs of right-sided ocular pain. On physical examination, a large swelling at the medial aspect of the right orbit was evident. Gross thickening, alopecia, and hyperkeratinization of the periorbital skin were observed, mainly on the upper eyelid, which was suspected to be an occult periocular sarcoid. Enophthalmos with deviation of the globe dorsally and caudally was present, along with blepharospasm and mucopurulent epiphora. The third eyelid body appeared thickened, but the free margin appeared normal. Vision seemed unaffected. The medial part of the cornea had multiple subepithelial excavations, but results of fluorescein staining were negative. Menace and dazzle reflexes were present. The pupil was miotic, which was thought to be in response to pain. On ophthalmoscopic examination, observation of the posterior segment of the eye was limited, but multiple raised retinal folds and a decrease in vascularity ofthe optic nerve were seen. A transpalpebral ultrasonographic examination of the orbit was performed (Figure 1).