| Stage |
Features |
| I |
Macroscopically encapsulated with no microscopically detectable capsular invasion |
| II |
Macroscopic invasion of mediastinal fatty tissue or mediastinal pleura, or microscopic invasion into the capsule |
| III |
Macroscopic invasion into surrounding structures(pericardium, great vessels, lung) |
| IVA |
Pleura or pericardial dissemination |
| IVB |
Lymphogenous or hematogenous metastases |
