Choroidal melanoma in a dog.

A 7-year-old male Great Dane dog was presented with blindness and a hemorrhagic retinal detachment in the right eye. Ocular ultrasonography revealed a conical-shaped mass in the posterior segment that protruded into the vitreous cavity. Histologic examination of the enucleated eye revealed a heavily-pigmented melanocytoma arising from the choroid lateral to the optic disc.