CLL Richter transformation to DLBCL and ERIC consensus guidelines. The photomicrograph (original magnification ×200; hematoxylin and eosin stain) depicts an area of SLL/CLL to the left and an infiltrate of large transformed cells in sheets, which corresponds to Richter transformation to DLBCL, in the right part of the photo. Some of the important points from the international consensus recommendations on diagnosis, evaluation, and research of Richter transformation are listed in the figure.