Cytology and FC of DLBCL. a Smear showing a population of large-sized lymphocytes. Nuclei have evident nucleoli. Diff-Quik stain. ×430. b-d FC histograms showing CD19 positivity and CD5 negativity(b), CD19 positivity and CD10 negativity(c), and λ light chain restriction in a small number of cells(d).