Figure 2. 42-year-old man with AIDS and Rhodococcus pneumonia (case 3). (a) High-resolution CT shows consolidation with areas of cavitation in the upper segment of the left lower lobe. Note adjacent centrilobular nodules (white curved arrows) and ground-glass opacities. (b) High-resolution CT demonstrates small centrilobular nodules and ground-glass opacities in the periphery of the consolidation (black arrow). Also note centrilobular nodules (white curved arrows) and "tree in bud" pattern (black curved arrows).