Vaccine-associated sarcomas are serious tumors that can be life-threatening. Know what to look for.

By Bev Caldwell

Fibrosarcomas are malignant tumors of connective tissue cells. They are solitary tumors of variable size, irregular or nodular in shape, and are the third most common skin tumor in the cat. In most cases the cause is unknown, but tumors found in young cats — or those that appear as multiple rather than solitary masses — may be caused the feline sarcoma virus (FeSv), a close relative of the feline leukemia virus (FeLV). Some fibrosarcomas appear at places on the body where vaccines have been given, and are referred to as “vaccination-associated sarcomas.” …

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