Figure 2. (A, B, C) Mild active lesion. Chest radiograph and computed tomography (CT) scan of the same patient showing a solitary pulmonary nodule. Moderate active lesion: (D) chest radiograph showing intersticial lesions with bronchial wall thickening (arrow) and (E) CT scan showing consolidation, ground-glass opacities, and intersticial lesions with tree-in-bud pattern (arrow). (F, G) Severe active lesion. Mixed lesions involving > 1/3 of the total pulmonary parenchyma with cavitary lesions.