A malignant (clonal) proliferation of B- lymphocytes or T- lymphocytes which involves the lymph nodes, bone marrow and/or extranodal sites. This category includes Non-Hodgkin lymphomas and Hodgkin lymphomas. The disease is lymphoma (MONDO_0005062). Also known as: lymphoid cancer, lymphoma (Hodgkin and non-Hodgkin), lymphoma (Hodgkin's and non-Hodgkin's), lymphoma, malignant, lymphomatous, malignant lymphoma.