Grade | Description | Histologic features |
0 | Normal | Scattered plasma cells in lamina propria; no lymphoid follicles |
1 | Chronic active gastritis | Small clusters of lymphocytes in lamina propria; no lymphoid follicles; no LELs |
2 | Chronic active gastritis with florid lymphoid follicle formation | Prominent lymphoid follicles with surrounding mantle zone and plasma cells; no LELs |
3 | Suspicious lymphoid infiltrate in lamina propria, probably reactive | Lymphoid follicles surrounded by small lymphocytes that infiltrate diffusely in lamina propria and occasionally into epithelium |
4 | Suspicious lymphoid infiltrate in lamina propria, probably lymphoma | Lymphoid follicles surrounded by CCL cells that infiltrate diffusely in lamina propria and into epithelium in small groups |
5 | Marginal zone lymphoma | Presence of dense diffuse infiltrate of CCL cells in lamina propria with prominent LELs |
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