DLBCL, gray zone lymphomas, and Hodgkin lymphomas. MLBCL and T-cell/histocyte-rich large B-cell lymphoma (T/HRBCL) are considered “gray zone lymphomas,” which share certain characteristics of large B-cell lymphomas and Hodgkin lymphomas (cHL and NLPHL, respectively), including increased host inflammatory response. The similarities among these entities point to a group of tumors that are partially defined and possibly driven by their interaction with the host microenvironment. Reprinted with permission from Abramson and Shipp.²