Figure 1. MALT lymphoma. Small monocytoid lymphocytes and some plasma cells in the lamina propria of the gastric mucosa (1a, 1b, 1c). These cells were diffusely positive for CD20 and CD79a, forming a lymphoepithelial lesion. Kappa light chain restriction was demonstrated on neoplastic cells. Bcl10 was negative by immunohistochemistry.
