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M classification for appearance on chest CT for TNM 8th edition
| M classification | M component on CT | |
|---|---|---|
| M0 | No distal metastasis | |
|
| ||
| M1 | M1a | Intrathoracic metastasis |
| Pleural effusion | ||
| Pericardial effusion | ||
| Contralateral lung nodules/pleural nodules | ||
| M1b | Single extrathoracic metastasis in a single organ | |
| M1c | Multiple extrathoracic metastasis | |
