A soft tissue tumor is an abnormal growth that occurs in the soft tissues of the body, which include muscles, fat, blood vessels, nerves, and connective tissues. These tumors can be benign (non-cancerous) or malignant (cancerous) and can develop in various locations, such as the arms, legs, or trunk. Diagnosis typically involves imaging tests like MRI or CT scans and may require a biopsy to determine the nature of the tumor. Treatment options vary based on the type and location of the tumor and may include surgery, radiation therapy, or chemotherapy.