Synchronous early gastric and intestinal mucosa-associated lymphoid tissue lymphoma in a Helicobacter pylori-negative patient: A case report

Figure 4 Endoscopic images and immunohistochemical results of colon mucosa-associated lymphoid tissue lymphoma. A: Endoscopic images showing a single 5mm polypoid lesion; B: Hematoxylin-eosin staining of lymphocytic infiltration (200×); C: Immunohistochemistry showed that the lymphoid cells were diffusely positive for B cell marker CD20 (400×); D: CD21 showed expansion and destruction of follicular dendritic cells (400×); E: Immunohistochemical stains showed Bcl-2 negative (100×).