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IMIG TNM staging system |
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| Primary tumour (T) |
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| T1a |
Tumour limited to the ipsilateral parietal including mediastinal and diaphragmatic pleura, no involvement of the visceral pleura |
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| T1b |
Tumour involving the ipsilateral parietal including mediastinal and diaphragmatic pleura, scattered foci of tumour also involving the visceral pleura |
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| T2 |
Tumour involving each of the ipsilateral pleural surfaces (parietal, mediastinal, diaphragmatic and visceral pleura) with at least one of the following features: • involvement of diaphragmatic muscle • confluent visceral pleural tumour (including the fissures) • extension of tumour from visceral pleura into the underlying pulmonary parenchyma |
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| T3 |
Locally advanced but potentially resectable tumour; tumour involving all of the ipsilateral pleural surfaces (parietal, mediastinal, diaphragmatic and visceral pleura) with at least one of the following features: • involvement of the endothoracic fascia • extension into the mediastinal fat • solitary, completely resectable focus of tumour extending into the soft tissues of the chest wall • non transmural involvement of the pericardium |
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| T4 |
Locally advanced technically unresectable tumour; tumour involving all of the ipsilateral pleural surfaces (parietal, mediastinal, diaphragmatic and visceral) with at least one of the following features: • diffuse extension or multifocal masses of tumour in the chest wall with or without associated rib destruction • direct transdiaphragmatic extension of tumour to the peritoneum • direct extension of tumour to the contralateral pleura • direct extension of tumour to one or more mediastinal organs • direct extension of tumour into the spine: tumour extending through to the internal surface of the pericardium with or without a pericardial effusion • tumour involving the myocardium |
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| Lymph nodes (N) |
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| Nx |
Regional lymph nodes cannot be assessed |
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| N0 |
No regional lymph node metastases |
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| N1 |
Metastases in the ipsilateral bronchopulmonary or hilar lymph nodes |
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| N2 |
Metastases in the subcarinal or the ipsilateral mediastinal lymph nodes including the ipsilateral internal mammary nodes |
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| N3 |
Metastases in the contralateral mediastinal, contralateral internal mammary, ipsilateral or contralateral supraclavicular lymph nodes |
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| Metastases (M) |
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| Mx |
Presence of distant metastases cannot be assessed |
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| M0 |
No distant metastasis |
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| M1 |
Distant metastasis present |
Moore et al. Orphanet Journal of Rare Diseases 2008 3:34 doi:10.1186/1750-1172-3-34 |
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