Table 1

Scoring assessment of invasion of local mediastinal structures

1. Aortic invasion based on Picus' angle
 0No contact/<45
2. Aortic invasion based on triangle effacement
 0No effacement
3. Pericardial invasion
 0No contact
 1Absent fat plane, unless criterion 2
 2Absent fat plane at tumour level, not above or below
4. Major airway invasion
 0No contact
 1Abutment only
 2Bulging or displacement