Fig. 7. Peripheral T-cell lymphoma (PTCL) with diffuse large B-cell lymphoma (DLBCL). A) Low magnification view of a case of PTCL with DLBCL. Note the presence of vascular proliferation and admixed lymphoid infiltrate. B) High magnification view displaying large lymphoid cells in the background of medium-sized cells with abundant pale/clear cytoplasm. C) CD4 immunostain highlights medium-sized neoplastic T-cells. D) These neoplastic T-cells express the T follicular helper marker BCL6. E) CD20 highlights B-cells, many of which are large in size and form aggregates. F) CD30 immunostain highlights immunoblasts but does not detect any Hodgkin/Reed-Sternberg-like cells, which can be seen in some PTCL. G) Ki-67 immunostain accentuates numerous proliferating lymphoma cells of DLBCL. H) In situ hybridization for EBV-encoded small RNA (EBER) is negative.