Abnormal expansions of granular lymphocytes: Reactive lymphocytosis or chronic leukemia? case report and literature review

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Abstract
A case of chronic lymphoproliferative disorder is presented, wherein a morphologically homogeneous population of lymphoid cells displayed properties similar to those described for large granular lymphocytes (LGL). Besides their LGL-like phenotype (VEP 13+, OKM 1+, OKT 10+ Fc-IgG-receptor+, OKT 3−), the proliferating cells were cytotoxic to NK targets as well as to antibody-coated target cells. Clinically, our patient presented low-grade lymphocytosis, splenomegaly, neutropenia, hyperimmunoglobulinemia and recurrent infections. Based upon this and 32 similar cases reported in the literature, we conclude that lymphoproliferative disorders involving GL encompass a variety of clinical entities, ranging from reactive GL lymphocytoses to overt lymphocytic malignancies.