Evaluation of the margins of differentiated early gastric cancer by using conventional endoscopy

Figure 1 A case of a delineating lesion (0-IIa). Before (A) and after (B) indigo-carmine dye, the margin of the tumor was clear.

Figure 2 An undelineated margin lesion. A: A case of an undelineating lesion (0-IIc) with ulceration findings; B: After indigo-carmine dye, the margin of the tumor was still unclear.

Figure 3 Cases of accurate and inaccurate markings. A: A case of accurate markings. The purple lines indicate the tumor area. The red crosses indicate the marking; B: A case of inaccurate markings. The purple lines indicate the tumor area. The red crosses indicate the marking.

Figure 4 Flow chart of this study.