Transformed gastric mucosa-associated lymphoid tissue lymphoma originating in the colon and developing metachronously after Helicobacter pylori eradication: A case report

Figure 3 Histopathological findings. A: Large abnormal lymphoid cells with enlarged nuclei were proliferating into the glandular ducts (Hematoxylin & eosin staining); B and C: These lymphoid tumor cells were positive for CD20 immunostaining (B) and for c-myc immunostaining (C); D: The MIB-1 index was positive in more than 90% of the tumor cells. Pathological diagnosis of diffuse large B-cell lymphoma was made.