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===A cancer is defined as an unchecked cell growth that begins in one region of the body and spreads to others. Cancerous cells usually spread to other organs via circulatory and lymphatic vessels. However, lymphatic cancer, or lymphoma, specifically refers to any cancer that originates in lymph nodes or vessels.=== ===In general, the lymphatic system consists of lymphatic nodules, or lymph nodes, the spleen, the thymus gland, and a network of lymphatic vessels. The system as a whole has three major functions. It extracts proteins from the fluid excreted by blood capillaries and inserts them back into the circulatory system, and also transfers fats to the bloodstream. The system is also used for detection and combat of bacteria, viruses and, ironically, cancerous cells. An important cell found within lymph vessels is the T-lymphocyte, better known as the T-cell, a specialized infection-fighting white blood cell.===


 * Images**
 * Left**: The Lymphatic system - http://lymphaticdisorders.files.wordpress.com/2008/11/lymphsystema.gif
 * Bottom**: A T-Cell - http://laplacian.files.wordpress.com/2009/01/t-cell2.jpg