Ocular melanocytic neoplasia.

Tumors of melanocytic origin in ocular tissues are relatively uncommon in dogs and cats, and although many are benign, some have a high potential for metastasis. In addition, even small ocular masses can be significant due to their potential vision-threatening sequelae. Such tumors may occur on the eyelids, on the conjunctival surface, along the limbus, or within the uveal tract. While several similarities exist among these tumors, the prognosis and recommended treatment options vary based on the species affected as well as the location, extent, and histologic characteristics of the tumor. This article reviews the clinical presentation, biologic behavior, and treatment options for eyelid, conjunctival, limbal (epibulbar), and uveal tumors of melanocytic origin in dogs and cats.