Metastasizing Melanoma

Q: There’s a gray lesson horse in his early 20s at my barn who has had melanoma growths under his tail for years. They don’t seem to cause him discomfort, and his riders always keep that area very clean. In the past week, however, he’s started losing his balance occasionally and is showing neurologic signs. The vet is coming out to see him, but is it possible that the melanoma has spread to his central nervous system? If so, is there anything that can be done? —Ashley,

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