Today's Veterinary Practice

NOV-DEC 2018

Today's Veterinary Practice provides comprehensive information to keep every small animal practitioner up to date on companion animal medicine and surgery as well as practice building and management.

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FEATURES NOVEMBER/DECEMBER 2018 37 Clinical Approaches to Common Ocular Tumors OPHTHALMOLOGY Allison A. Fuchs, DVM, BluePearl Veterinary Partners, Atlanta, Georgia Ellen B. Belknap, DVM, MS, DACVO, DACVIM (Large Animal) BluePearl Veterinary Partners, Lawrenceville, Georgia In companion animals, intraocular tumors are relatively uncommon, but those that do occur can be primary, metastatic, or locally invasive. Tumors can appear as discrete masses, diffuse changes, or even after uveitis. Learning to recognize the presence of a mass and differentiate it from an infectious or benign disease process can help you determine when to recommend medical treatment, surgery, or referral to an ophthalmologist. Here we review the types of intraocular neoplasia most frequently seen in our canine and feline patients, the differentiating features helpful for diagnosis, prognosis, and treatment guidelines. We discuss each species separately. DOGS Primary Intraocular Tumors In dogs, the most common location for primary intraocular masses is the anterior uvea (iris and ciliary body). The most common type of uveal neoplasia is melanocytic tumors, which include melanomas and melanocytomas. 1 These tumors must be distinguished from the following: ■ Iris nevi (freckles, flat areas of pigmentation that may become larger but do not progress to inflammation or nodular growth) ■ Iris cysts (may be freely moveable within the anterior chamber and generally have a distinctive spherical shape. Iris cysts may be darkly pigmented to fainter brown or even nonpigmented and can generally be distinguished from masses by transillumination ( FIGURE 1A AND 1B ) ■ Intraocular extension of limbal melanocytic tumors ■ Ocular melanosis (an inherited, bilateral, progressive deposition of pigmented cells that leads to glaucoma, occurring most commonly in Cairn terriers 2 ) ■ Other tumor types LOW METASTATIC POTENTIAL The overall prognosis for life in most primary intraocular neoplasias is good.

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