Breast tumours can develop from several parts of the bosom. The bosom is an organ that lies on top of the upper ribs and chest muscles. There is a left and right breast, and everyone has organs, conduits, and greasy tissue. The bosom in women produces and transports milk to care for new borns and new born children. The amount of oily tissue in the bosom determines the size of each breast. Its treatment is determined on the stage of sickness. It might include chemotherapy, radiation, chemical treatment, and medical procedures.