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Table 1 Radiation-induced lung injury grading scale (RGS)

From: High-dose thoracic radiation therapy for non-small cell lung cancer: a novel grading scale of radiation-induced lung injury for symptomatic radiation pneumonitis

  Number of affected lung segments on thoracic computer tomography scan   
RGS  < 4 segments 4–5 segments  > 5 segments
0 No changes No changes No changes
1 Ground glass opacity   
Mild Consolidation   
   Nodular   
   Patchy   
   Confluent   
  Ipsilateral pleural effusion < 1 cm   
  Volume loss   
  Pleural thickening   
  Interstitial changes   
  Fibrosis   
2 Ipsilateral pleural effusion 1–2 cm Ground glass opacity  
Moderate   Consolidation  
    Nodular  
    Patchy  
    Confluent  
   Volume loss  
   Pleural thickening  
   Interstitial changes  
   Fibrosis  
3 Ipsilateral pleural effusion > 2 cm   Ground glass opacity
Severe    Consolidation
     Nodular
     Patchy
     Confluent
    Volume loss
    Pleural thickening
    Interstitial changes
    Fibrosis