. CD20 staining performed on 1 of these lymphoblastic lymphomas and the large cell lymphoma showed a diffuse cytoplasmic reaction, respectively, in 2% and 0% only but positive staining of the nucleoli in 96% and 84% of cells, respectively. Another lymphoblastic lymphoma case, which did not have an adequate number of CD3-positive cells to label it as of T-cell lineage also showed CD20 positive nucleoli in 60% of cells and a diffuse cytoplasmic reaction for CD 20 in 5% of cells.