Hematological malignancies can be divided into leukemias, lymphomas, and multiple myeloma. Lymphomas can be divided into Hodgkin's lymphoma and non-Hodgkin's lymphoma. Non-Hodgkin's lymphoma can be subdivided into aggressive lymphoma and indolent lymphoma. Aggressive non-Hodgkin's lymphoma includes: *Diffuse large B-cell lymphoma (DLBCL) *Burkitt's lymphoma. *Mantle cell lymphoma. *Precursor T-cell lymphoblastic lymphoma. *B-lymphoblastic lymphoma. Indolent non-Hodgkin's lymphomas include: *Follicular lymphoma *Marginal zone B-cell lymphoma (MALToma) *Hairy cell leukemia/ lymphoma. *Waldenstrom macroglobulinemia. *Mycosis fungoides/ Sezary syndrome.