Lymphocytes are white blood cells that have important immune functions. The main populations of lymphocytes are B cells, T cells and natural killer (NK) cells. They are typically (although not ...

Another speculation is that the multiclonal lymphocytes may proliferate in a polyclonal fashion until one clone emerges, acquires malignant characteristics and then develops into frank lymphomas.

Type AB → mixed thymoma. Type B1 → predominantly cortical and lymphocyte-rich thymoma. Type B2 → cortical thymoma. Type B3 → squamoid, well-differentiated thymic carcinoma. Type C → thymic carcinoma.