Table 1 Masaoka staging system
From: Ectopic thymoma of the lung; a rare case report and review of the literature
Masaoka staging system [7] | Â |
|---|---|
STAGE I | Macroscopically encapsulated with no microscopically detectable capsular invasion. |
STAGE II | Macroscopic invasion of mediastinal fatty tissue or mediastinal pleura or microscopic invasion into the capsule. |
STAGE III | Macroscopic invasion into surrounding structures (pericardium, great vessels, lung). |
STAGE IV | (A) Pleural or pericardial dissemination. |
| Â | (B) Lymphogenous or hematogenous metastases. |