Fig. 3.

Pneumonia Severity Categories vs Co-LA. Case 1. 81-year-old woman without vaccination, lung disease, or smoking history. Initial CT was performed one day after diagnosis. Focal consolidation or ground-glass opacities (GGOs) were confirmed mainly in peripheral lesions, which is consistent with Pneumonia Score 3. On CT scan performed 22 months after diagnosis, minimal subpleural GGOs were seen in the subpleural region of left lower lobe, which is consistent with indeterminate Co-LA. Case 2. 42-year-old woman without lung disease or smoking history. Initial CT scan was performed three days after diagnosis. Multiple consolidation or ground-glass opacities (GGOs), including reversed halo pattern, were confirmed mainly in peripheral areas. This case is consistent with Pneumonia Score 4. On CT scans obtained nine months after diagnosis, all the opacities have resolved, which is consistent with no Co-LA. Case 3. 56-year-old woman with unknown smoking history, and without vaccination or lung disease. CT performed 22 days after diagnosis showed diffuse GGOs or consolidations accompanying focal spared areas, which is consistent with Pneumonia Score 5. On CT scan obtained 16.5 months after diagnosis, subpleural linear opacity, GGO, and interlobular septal thickening remained in subpleural areas. Mild traction bronchiolectasis was also identified, consistent with fibrotic Co-LA. Co-LA, post-COVID-19 lung abnormalities; GGO, ground-glass opacity.