Table 1.
Pneumonia Score: CT severity score based on pattern and extent of COVID-19.
| Pneumonia Score | Pattern | Estimated Extent* |
|---|---|---|
| 0 | No pneumonia | 0% |
| 1 | GGO | < 10% |
| 2 | Transition from GGO to OP patten | 10–20% |
| 3 | OP pattern† | 20–40% |
| 4 | Extensive OP pattern | 40–70% |
| 5 | DAD pattern‡ | > 70% |
GGO, ground-glass opacity; OP, organizing pneumonia; DAD, diffuse alveolar damage;
AIP, acute interstitial pneumonia
*Extent was estimated based on the percentage of lung involvement in the entire bilateral lungs
†OP patten is characterized by multifocal bilateral parenchymal consolidation
‡DAD pattern is characterized by diffuse or multifocal GGOs/consolidation predominantly in dependent lung region, may be accompanied by lung volume loss and traction bronchiectasis