CT features of acute and chronic obstruction of pulmonary arteries
| CT Features | Acute PE | Chronic PE |
| Mediastinal images | ||
| Partial filling defects | Yes | Yes |
| Complete filling defects | Yes | Yes |
| Arterial retraction | Yes | |
| Reperfusion channels | Yes | |
| Webs, bands | Yes | |
| Focal stenosis | Yes | |
| Enlarged bronchial arteries | Yes | |
| Enlarged nonbronchial systemic arteries | Yes | |
| Pleural abnormalities | Yes (effusion) | Yes |
| Lung images | ||
| Lung infarction/sequelae | Yes (subpleural, wedge-shaped consolidation) | Yes (nonspecific fibrotic infiltration/cysts) |
| Bronchial dilatation | Yes (adjacent to severely stenosed arteries) | |
| Mosaic perfusion | Yes |
PE: pulmonary embolism.