Fig. 4From: Pleural effusion as an initial manifestation in a patient with primary pulmonary monoclonal B-cell lymphocyte proliferative diseasePhenotypic lymphocyte screening by flow cytometry of left pleural effusion showed monoclonal B-cell lymphocyte proliferation. Lymphocytes (p1, red): 95% of nucleated cells. B cells: 28% of lymphocytes, expressing CD19 and CD38, partially expressing CD5, and highly expressing kappa light chain, κ:λ ~ 5.3Back to article page