Along this network of vessels are small, bean-shaped organs called lymph nodes. Clusters of lymph nodes are founded in the underarms, groin, neck, chest, and abdomen. Other parts of the lymphatic system are the spleen, thymus, tonsils, and bone marrow. Lymphatic tissue is also found in other parts of the body, including the stomach, intestines and skin. Like all types of cancer, lymphomas are diseases of the body's cells.
Healthy cells grow, divide and replace themselves in an orderly manner.
This process keeps the body in good repair. In the non-Hodgkin's lymphomas, cells in the lymphatic system grow abnormally. They divide too rapidly and grow without any order or control. Too much tissue is formed, and tumors begin to grow. The cancer cells can also spread to other organs.