Group | Description | Definition (by chest CT scan) |
A | Mediastinal infiltration | Tumor mass within the mediastinum such that discrete lymph nodes cannot be distinguished or measured* |
B | Enlarged discrete mediastinal nodes | Discrete mediastinal nodes ≥1 cm in short-axis diameter on a transverse CT image |
C | Clinical stage II or central stage I tumor | Normal mediastinal nodes (<1 cm) but enlarged N1 nodes (≥1 cm) or a central tumor (within proximal one-third of the hemithorax) |
D | Peripheral clinical stage I tumor | Normal mediastinal and N1 nodes (<1 cm) and a peripheral tumor (within outer two-thirds of hemithorax) |
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