Figure 6a. High-grade gastric MALT lymphoma with rugal thickening in a 45-year-old man. The probable diagnosis was lymphoma. (a) Spot radiograph shows thickened nodular folds (arrows) in the greater curvature of the gastric body. No abnormal finding besides rugal thickening was observed in the resected specimen. (b) Low-power photomicrograph (original magnification, x200; hematoxylin-eosin stain) shows the characteristic lymphoepithelial lesions formed by invasion of individual glands (arrows) or surface epithelium (arrowheads) by high-grade lymphoma cells that displace or destroy the glandular epithelium.