Figure 3. Moderate and severe active lesions. (A) Moderate lesion showing > 3 ground-glass nodules (arrow). (B) Besides ground-glass nodules (arrows), cavitary lesions with and without septations (arrowheads) in greater amount, characterizing severe classification. (C) Bronchiectasis inside consolidation opacity (arrow) and bronchial wall thickening (arrowheads). (D) Focal lesions, ground-glass and intersticial opacities with interlobular septal thickening (arrowhead) and small centrilobular nodules (arrow). (E) Chest radiograph showing only interstitial opacities, a finding in which CT helps to better characterize and classify the lesions. (F) Bronchial wall thickening (tram-track sign) better observed in this patient with severe lesion (arrow).