Table 2.
Typical HRCT finding, lesions distribution, and acute exacerbation features on HRCT scans in COVID-19 and pSS-ILD from various studies [14–18].
| COVID-19 | pSS–ILD | |
|---|---|---|
| Typical findings | ||
| GGO | 71.64% | 87.88% |
| Vascular enlargement | 65.41% | — |
| Subpleural bands | 52.54% | — |
| Interlobular septal thickening | 43.28% | — |
| Septal/subpleural lines | — | 81.82% |
| Pleural thickening/irregularities in pleural margins | 38.25% | 21% |
| Consolidation | 29.15% | — |
| Crazy paving pattern | 28.74% | — |
| Subpleural cysts | — | 40.90% |
| Honeycombing | — | 28.79% |
| Bronchial wall thickening | 20.71% | — |
| Traction bronchiectasis | 20.36% | — |
| Parenchymal micronodules/nodules | 14.84% | 92.42% |
| Distribution | Bilateral, peripheral distribution | Bilateral, symmetric distribution |
| Acute respiratory distress syndrome/acute exacerbation | Patchy confluent areas of GGO and consolidations with a typical anteroposterior gradient | New extensive bilateral GGOs, sometimes accompanied with consolidations, with a variable distribution (peripheral, multifocal or diffuse) |
— = no available data.