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Thymomas and thymic carcinomas are rare tumors that form in cells on the outside surface of the thymus. The thymus is a small organ that lies in the upper chest under the breastbone. It is part of the lymph system and makes certain types of white blood cells that help the body fight infection...
The lymphatic system is part of the immune system. The lymphatic system includes lymph vessels that branch into all the tissues of the body; lymph, clear fluid that contains white blood cells, especially lymphocytes such as B cells and T cells; and lymph nodes, where lymph vessels are co...