paraimmunoblast

par·a·imm·un·o·blast

(par'ă-im'myū-nō-blast),
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.
References in periodicals archive ?
Chronic lymphocytic leukemia/small lymphocytic lymphoma (CLL/SLL) is a neoplasm of small, round, mature B lymphocytes, often admixed with prolymphocytes and paraimmunoblasts.