A soft tissue sarcoma (STS) is a malignant tumor that starts in soft tissue such as muscle, deep skin tissues, cartilage, or fat. It often occurs as a lump in the arm, although it can happen anywhere.
Soft tissue sarcoma is metastatic if it has spread to areas in the body away from the location of the original tumor. Soft tissue sarcoma may spread through the bloodstream or lymphatic system to ...
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