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Canine Soft Tissue Sarcoma

Soft tissue sarcomas include several different tumor types. They originate in connective tissues, including muscle, fat, neurovascular and fibrous tissue, and they include spindle cell tumors, fibrosarcomas, and others. Most of these tumors are first noticed as a mass either on the surface of the skin or just under the skin, and they grow over weeks to months. Sarcomas are locally invasive tumors with only 10% to 18% spreading to distant tissues (metastasis). When the tumor is classified as “high grade” based on microscopic changes, the chance of metastasis may be higher. These tumors can occur in any breed and their cause is unknown.