However, if a malignant melanoma has had the opportunity to spread to distant areas of the body, long term survival of the dog is more difficult. (caninecancer.com)
If this is a malignant cancer, it can be much more serious than benign and can spread to distant areas in the body threatening the life of your rabbit. (smallanimalchanel.com)
The tumors can spread locally, affecting adjacent tissues, but long term, if left untreated, it can spread to distant areas like lymph nodes or lung tissue. (cathealth.com)