Table 4 Histological grading of lymph node metastases [28]
Grading | Pathological features | score |
|---|---|---|
Grade 0 | Without metastasis | 0 |
Grade I | There are piles of tumor cells only in the marginal sinus of lymph nodes, forming small metastases, and sometimes mitotic figure is seen | 1 |
Grade II | There are obvious metastases both in the marginal and central sinus of lymph nodes | 2 |
Grade III | Lymph nodes are mostly filled with tumor cells and common lesions can be observed in metastases | 3 |
Grade IV | More than one lymph node has metastases, forming extensive metastases | 4 |