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Classification of PVTT
| Types |
|---|
| Type I0: Tumor thrombi formation found under microscopy |
| Type I: Tumor thrombi involving segmental branches of portal vein or above |
| Type II: Tumor thrombi involving right/left portal vein |
| Type III: Tumor thrombi involving the main portal vein trunk |
| Type IV: Tumor thrombi involving the superior mesenteric vein |
