Chronic lymphocytic leukaemia or small lymphocytic lymphoma

**Definition:** An indolent, mature B-cell neoplasm composed of small, round B-lymphocytes. When the bone marrow and peripheral blood are involved, the term chronic lymphocytic leukaemia is used. The term small lymphocytic lymphoma is restricted to cases which do not show leukemic involvement of the bone marrow and peripheral blood.

**Inclusions:** - Small cell B-cell lymphoma