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Figure 5b. S aureus bronchiolitis in a 32-year-old man with acquired immunodeficiency syndrome (AIDS). (a) High-resolution CT scan shows small peripheral centrilobular nodules and branching linear opacities, resulting in the tree-in-bud pattern. (b) Photomicrograph (original magnification, x400; hematoxylin-eosin stain) shows inflammatory material composed of leukocytes filling the bronchiolar lumen (arrow).