Table 1 Classification of VI
From: Grading criteria for venous invasion in thoracic esophageal squamous cell carcinoma
V0 (None) | V1 (Slight) | V2 (Moderate) | V3 (Severe) | ||
|---|---|---|---|---|---|
V-number | 0 | 1–3 | 1–3, | 4 | ≥ 4 |
V-size (mm) | 0 | < 1 | ≥ 1 | < 1 | ≥ 1 |
EMVI | Absent | Absent | Absent | Absent | Present* |