also make surgery easier. They also spread to distant sites, especially the lungs, and some types of sarcomas spread to nearby lymph nodes .
What Causes It In most cases the cause is unknown, although some sarcomas are related to certain diseases or exposure to specific agents. Soft tissue sarcomas do not arise from benign tumors, but some apparently benign bone tumors—cartilage or benign giant cell tumors, for example—can become malignant . Malignant bone tumors are more common in adolescence, supporting the theory that these tumors may occur because of rapid growth.
