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In this case we observed pro-lymphocytes (medium size with round nucleus and moderately dense chromatin and faintly basophilic cytoplasm) in our 58 years old male patient bone marrow sample (Fig. A). In harmony with existence of pro-lymphocytes and mature lymphocytes, immunophenotyping using flow-cytometry showed positivity of CD5/19/20/22/23 (Fig. B & Fig. C). complete blood count of patient showed leukocytosis with absolute lymphocytosis, anemia and thrombocytopenia (Fig. D).