T Staging
Tx: primary tumor cannot be evaluated; or sputum, bronchial washings find cancer cells but imaging
or bronchoscopy did not visualize the tumor.
T0: no evidence of primary tumor.
Tis: carcinoma in situ.
T1: tumor ≤3 cm in maximum diameter, surrounded by lung or dirty pleura, microscopic tumor
did not involve more than lobar bronchus (i.e., did not involve main bronchus).
① T1a: the maximum diameter of the tumor is ≤2 cm.
② T1b: the maximum diameter of the tumor is 2-3 cm.
T2: Tumor size or extent meets any of the following points.
① Tumor maximum diameter >3 cm and ≤7 cm.
② Involvement of main bronchus, but ≥2 cm from the bulge.
③Involvement of the dirty pleura.
④Spread to the hilum causing atelectasis or obstructive pneumonia (not involving the whole lung).
⑤ T2a: the maximum diameter of tumor is 3-5cm (or other factors cause T2 but the maximum tumor
diameter ≤5cm).
(6) T2b: the maximum diameter of the tumor is 5-7cm.
T3: Tumor of any size, but directly invades any of the following areas.
① chest wall (including superior sulcus tumor), diaphragm, mediastinal pleura, wall pericardium.
②Tumor in the main bronchus, less than 2 cm from the bullae (without involving the bullae).
③Pulmonary atelectasis or obstructive inflammation of the whole lung.
④Tumor metastases in the same lobe.
⑤ The maximum diameter of the tumor is greater than 7 cm.
T4: Regardless of the size of the tumor, but invading the following sites.
①Mediastinum, heart, large blood vessels, trachea, esophagus, vertebrae, and aorta.
②Tumor metastases in different lobes of the lung ipsilateral to the primary site.
N stage
Nx: unable to determine whether regional lymph node metastasis.
N0: No regional lymph node metastasis .
N1: Metastasis to ipsilateral paratracheal and/or ipsilateral hilar lymph nodes and direct invasion of the primary tumor into the lung
The lymph nodes within the lung were directly invaded by the primary tumor.
N2: Metastasis to the ipsilateral mediastinum and/or inferior bulbar lymph nodes.
N3: Metastasis to the contralateral mediastinum, contralateral hilar lymph nodes, ipsilateral or contralateral ramus or supraclavicular lymph nodes.
supra-limbar node.
M staging
Mx: No estimation of distant metastases.
M0: No distant metastasis.
M1a: malignant pleural fluid or malignant pericardial effusion.
M1b: with distant metastasis (Note: metastatic nodes ipsilateral to the primary tumor but in different lung lobes are
T4).
TNM staging.
Cryptogenic tumor
TX
N0
M0
Stage 0
Tis
N0
M0
M0
T1a, b
N0
M0
IB
T2a
N0
M0
IIA
T1a, b
N1
M0
T2a
N1
M0
T2b
N0
M0
IIB
T2b
N1
M0
T3
N0
M0
IIIA
T1, T2
N2
M0
T3
N1, N2
M0
T4
N0, N1
M0
IIIB
T4
N2
M0
Any T
N3
M0
IV
Any T
Any N
M1a,b