Figure 2: (A) Diffuse cellular infiltrate of atypical cells (Hematoxylin-eosin, original magnification x200). Immunohistochemical study: (B) postivity for CD20, (C) positivity for Bcl-2, (D) positivity for Bcl-6, (E) positivity for MUM-1, (F) Ki-67 > 70% activity.