FIGURE 2

A, Hematoxylin and eosin appearance of the pleomorphic T-cell lymphoma identified in the 1998 biopsy. B, 1998 biopsy stained with CD3, highlighting the diffuse lymphoma, but not the reactive follicle. C, 1998 biopsy stained with CD20, showing strong staining of both the lymphoma and the reactive follicle. D, 1998 biopsy stained with CD79a, marking only the reactive follicle, and not the lymphoma.