An intermediate-sized B cell, with a round to oval vesicular nucleus and a prominent, often central, nuleolus; usually found in the proliferative centers of chronic lymphocytic leukemia and small lymphocytic lymphoma.
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Chronic lymphocytic leukemia/small lymphocytic lymphoma (CLL/SLL) is a neoplasm of small, round, mature B lymphocytes, often admixed with prolymphocytes and paraimmunoblasts.