Figure 2

Pathological tumor characteristics of tumors with lymphatic, vascular, or perineural invasion and lymph node metastasis. (a) Lymphatic invasion. (b) Vascular invasion. (c) Perineural invasion. (d) Lymph node metastasis. In a–d, the number of intestinal-type Tis/T1a(A), T1a(O), and ≥ T1b lesions were 36, 8, and 13, respectively.