<P> Cancer of the lymphatic system can be primary or secondary . Lymphoma refers to cancer that arises from lymphatic tissue . Lymphoid leukemias and lymphomas are now considered to be tumors of the same type of cell lineage . They are called "leukemia" when in the blood or marrow and "lymphoma" when in lymphatic tissue . They are grouped together under the name "lymphoid malignancy". </P> <P> Lymphoma is generally considered as either Hodgkin lymphoma or non-Hodgkin lymphoma . Hodgkin lymphoma is characterised by a particular type of cell, called a Reed--Sternberg cell, visible under microscope . It is associated with past infection with the Epstein - Barr Virus, and generally causes a painless "rubbery" lymphadenopathy . It is staged, using Ann Arbor staging . Chemotherapy generally involves the ABVD and may also involve radiotherapy . Non-Hodgkin lymphoma is a cancer characterised by increased proliferation of B - cells or T - cells, generally occurs in an older age group than Hodgkin lymphoma . It is treated according to whether it is high - grade or low - grade, and carries a poorer prognosis than Hodgkin lymphoma . </P> <P> Lymphangiosarcoma is a malignant soft tissue tumor, whereas lymphangioma is a benign tumor occurring frequently in association with Turner syndrome . Lymphangioleiomyomatosis is a benign tumor of the smooth muscles of the lymphatics that occurs in the lungs . </P> <P> Lymphoid leukemia is another form of cancer where the host is devoid of different lymphatic cells . </P>

Which is not an organ of the lymphatic system