Table 1 Pathological classification and clinical staging of thymoma
From: Association between thymoma and persistent hypothermia: a case report
WHO Thymoma classification | 5-year survival rate (%) |
|---|---|
Type A | 100 |
Type AB | 93 |
Type B1 | 89 |
Type B2 | 82 |
Type B3 | 71 |
Masaoka Clinical Stage | Macroscopic or Microscopic Features |
I | Encapsulated tumour. No evidence of capsule invasion |
IIa | Macroscopic invasion into surrounding fatty tissue or mediastinal pleura |
IIb | Microscopic invasion into the capsule |
III | Macroscopic invasion into neighbouring organs including pericardium, major vessels or lung. |
IVa | Pleural or pericardial dissemination. |
IVb | Lymphogenous or haematogenous metastasis. |