Lymphoma is a general term for cancers that develop in the lymphatic system, the nodes, the collection of organs, tissues, and vessels that produce infection-fighting cells. Lymphomas are divided into two general types: Hodgkin's disease and non-Hodgkin's lymphomas. Hodgkin's disease is a specific type of lymphoma. Its biopsied tissue, when examined under a microscope, includes a certain number of cells called Reed-Sternberg cells. ....................................................... ...............know more about Hodgkin's disease Other cancers of the lymphatic system are called non-Hodgkin's lymphomas. Because lymphatic tissue is present in many parts of the body, non-Hodgkin's lymphoma can start almost anywhere in the body. Non-Hodgkin's lymphoma may occur in a single lymph node, a group of lymph nodes, or in another organ. This type of cancer can spread to almost any part of the body, including the liver, bone marrow, and spleen. ........................