Definition: Metasternal is a medical term that refers to a condition where there is a tumor or cancer that has spread beyond the body's usual boundaries. This means that the tumor or cancer has invaded the lymphatic system, which contains blood vessels and lymph nodes. The lymphatic system helps to protect the body from infection by removing infected cells and toxins. It's important to note that metasternal tumors are rare, and most cases of metasternal cancer occur in people who have undergone chemotherapy or radiation therapy for
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