Transformation of marginal zone lymphoma into high-grade B-cell lymphoma expressing terminal deoxynucleotidyl transferase: A case report

Figure 1 Immunohistochemistry and cellular morphology of the first lymph node biopsy. A: Tumor cells are diffuse, small to medium in size, with a slightly irregular nucleus. The lymphocytic hyperplasia shows partial cytoplasmic empty and a fuzzy nodular distribution (hematoxylin and eosin, 400 ×); B-I: The majority of the infiltrating cells were positive for CD20 (B), PAX5, B-cell lymphoma-2 (BCL-2) (F), CD21, CD23 (C), and negative for CD10 (I), CD5 (H), BCL-6 (G), and CyclinD1 (D). Their Ki-67 (E) showed approximately 10% (EnVision, 400 ×).