Diffuse Large B Cell Lymphoma Mimicking Granulomatosis with Polyangiitis

Figure 2

Histopathologic examination of intestinal biopsy.

(a) Diffuse infiltrate of large lymphoid cells in the intestinal wall (Hematoxylin and Eosin, ×300)

(b) Most of the large lymphoid cells show membranous staining for CD20 (Immunostain for CD20, ×300)

(c) Ki67 index over 90% of the large lymphoid cells (Immunostain for Ki67, ×200)

(d) Many of the large lymphoid cells show positive cytoplasmic staining for latent membrane protein of EBV (Immunostain for LMP-1, ×200)