Staging refers to the determination of the extent of cancer. An organ that is part of the lymphatic system, in which T lymphocytes grow and multiply. The thymus is in the chest behind the breastbone. Small masses of lymphoid tissue on either side of the throat. An abnormal mass of tissue that results from excessive cell division.
Tumors perform no useful body function.
High-energy radiation used in low doses to diagnose diseases and in high doses to treat cancer.