Thymus tumours (ICD10 C37.9)

T1a, T1b

N0

M0

T2

N0

M0

T3

N0

M0

T4

N0

M0

Any T

N1

M0

Any T

N0, N1

M1a

Any T

N2

M0, M1a

Any T

Any N

M1b

cTX

Primary tumour cannot be assessed

cT0

No evidence of primary tumour

cT1

Tumour limited to the thymus, with or without encapsulation, or directly invades the mediastinal pleura but does not involve any other mediastinal structure.

cT1a – 5 cm or less in its greatest dimension

cT1b – larger than 5 cm in its greatest dimension

cT2

Tumour with direct involvement of the pericardium (partial or full thickness), the lung or the phrenic nerve.

cT3

Tumour directly invades any of the following: the brachiocephalic vein, the superior vena cava, the chest wall or extrapericardial pulmonary arteries or veins.

cT4

Tumour with direct invasion into any of the aorta (ascending, arch or descending), arch vessels, intrapericardial pulmonary artery or veins, the myocardium, the trachea or the oesophagus.

cNX

Regional lymph nodes cannot be assessed

cN0

No regional lymph node metastasis

cN1

Metastasis in anterior (perithymic) lymph nodes

cN2

Metastasis in deep intrathoracic or cervical lymph nodes, including the paratracheal, subcarinal, aortopulmonary window, hilar, jugular and supraclavicular nodes.

cM0

No distant metastasis

cM1

Distant metastasis

cM1a - Separate pleural or pericardial nodule(s)

cM1b - Pulmonary intraparenchymal nodule(s) or distant metastases