T stage | Stomach wall | Fatty tissue infiltration | Invasion into adjacent organs | Contrast enhancement |
T1 | Local thickening of internal wall >5 mm, external layer is intact and is visualized as a strip of lower density. Tumor infiltrates mucosa or submucal layer. | Adjacent fatty tissue is well differentiated, no infiltration is observed. | None | Contrast enhancement is more intensive than in other parts of stomach mucosa. |
T2 | Tumor is observed as local or diffuse thickening of the wall, involving transmural layer. External layer is intact. Tumor infiltrates muscular and subserosal layers. | Adjacent fatty tissue is well differentiated, no infiltration is observed. | None | Contrast enhancement is more intensive than in other parts of stomach mucosa. |
T3 | Transmural tumor with uneven or nodulated involved external layer of the stomach. Tumor infiltrates serosal layer. | The differentiation of tumor-adjacent fatty tissue is poor. | None |
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T4 | Wide tumor infiltration. Tumor infiltrates adjacent structures. | No differentiation of adjacent fatty tissue. It is infiltrated. | Present |
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