Grading | Pathological features | score |
---|---|---|
Grade 0 | Without metastasis | 0 |
Grade I | There are 1 ~ 5 small metastases less than 1 mm in diameters in the lung and a mitotic figure is occasionally seen in the metastasis | 1 |
Grade II | There are 5 ~ 10 small metastases or 1 ~ 2 intermediate metastases between 1 ~ 2 mm in diameter | 2 |
Grade III | More than 10 small metastases are widely distributed or large metastases more than 2 mm in diameter occur in the lung | 3 |