| The Masaoka staging system-1981 |
| Stage |
|
Description |
| I |
|
Macroscopically encapsulated tumor without microscopic invasion of capsule |
| II |
|
Macroscopic invasion into surrounding fatty tissue or mediastinal pleura or microscopic invasion into capsule |
| III |
|
Macroscopic invasion into neighboring organs; i.e., pericardium, great vessels or lung |
| IV |
a |
Pleural or pericardial dissemination |
|
b |
Lymphogenous or hematogenous metastasis |
| The Masaoka-Koga staging system-1994 |
| Tumor stage |
|
Description |
| I |
|
Grossly and microscopically completely encapsulated tumor |
| II |
a |
Microscopic transcapsular invasion |
|
b |
Macroscopic invasion into thymic or surrounding fatty tissue, or grossly adherent but not breaking through mediastinal pleura or pericardium |
| III |
|
Macroscopic invasion of neighboring organs (pericardium, great vessels or lung) |
| IV |
a |
Pleural or pericardial dissemination |
|
b |
Lymphatic or hematogenous metastasis |
