Figure 5b. High-grade gastric MALT lymphoma with a mass and rugal thickening in a 64-year-old man. The probable diagnosis was lymphoma. (a) Spot radiograph shows a well-demarcated mass (solid arrows) in the antrum and disorganized thickened folds (open arrows) that are primarily proximal to the mass. (b) Photograph of the resected specimen shows disorganization of the thickened rugae (black arrows) proximal to the mass (white arrows). (c) High-power photomicrograph (original magnification, x400; hematoxylin-eosin stain) shows severe destruction of gastric glands by high-grade lymphoma cells.