Diffuse large B-cell lymphoma (DLBCL): the tumor composed of diffuse infiltration of large lymphoid cells in all wall layers of the affected terminal ileum. (a) Staining with hematoxylin-eosin, magnification ×40. (b) Staining with hematoxylin-eosin, magnification ×200. (c) Staining with hematoxylin-eosin, magnification ×400. (d) Immunoperoxidase staining for CD20, magnification ×400.
