Transabdominal ultrasonography in preoperative staging of gastric cancer

Figure 1 Sonograms of T1-T4 carcinoma. A: Submucosal carcinoma (T1) in gastric antrum. Arrow indicates segmental thickening of layers 1-3 of the posterior wall, triangle indicates normal layers 4-5. B: T2 carcinoma. The posterior wall of Gastric body is thickening. Arrow indicates the third hyperechoic layer is obliterated and the fourth hypoechoic layer is thickening, triangle indicates normal layer 5. C: T3 carcinoma. Tumor located in the greater curvature of stomach (STO) is hypoechoic with disap-pearance of wall all layer (arrow). D: T4 carcinoma. Sonogram shows tumor located in antrum (AN) infiltrating duodenum. Arrow indicates the segmental wall thickening of duodenal bulb.