Table 2.

The IASLC/ITMIG thymic epithelial tumors staging

Category			Definition
T	T1	a	Encapsultated or not with or without extension into mediastinal fat
	b	Extension into mediastinal pleura
	T2		Pericardium
	T3		Lung, brachiocephalic vein, superior vena cava, chest wall, phrenic nerve Hilar (extrapericardial) pulmonary vessels
T4		Aorta, arch vessels, main pulmonary artery, myocardium, trachea, or oesophagus
N	N0		No nodal involvrnent
	N1		Anterior (perithymic nodes
N2		Deep intra thoracic or cervical nodes
M	M0		No metastatic pleural, pericardial or distant sites
	M1	a	Separate pleural or pericardial nodule(s)
b	Pulmonary intraparenchymal nodule or distant organ metastasis