Benign vs malignant gastric ulcer (double‑contrast meal)
| Feature | Benign | Malignant |
|---|---|---|
| Projection | beyond the expected gastric contour (profile view) | within the gastric lumen |
| Ulcer mound/collar | smooth ulcer collar, Hampton line (thin lucent line of undermined mucosa at the neck) | irregular, nodular mass |
| Folds | smooth, regular, radiate to the crater edge | clubbed, fused, amputated, nodular, stop short of the crater |
| Shape | round/oval, sharp | irregular, shallow; Carman meniscus sign (convex inward ulcer within a heaped‑up mass, seen with compression) |
| Site | lesser curve, posterior wall | greater curve, fundus (any) |
| Healing | heals on treatment | does not |