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Figure 16. Allergic bronchopulmonary aspergillosis in a 36-year-old man with a history of asthma. High-resolution CT scans show peripheral mild bronchiolar dilatation and mucoid impaction in the anterior segment of the left upper lobe (long arrow) and the posterior segment of the right upper lobe, resulting in the tree-in-bud pattern. Note the bronchial wall thickening (short arrow).
