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Figure 4. Infection with M avium-intracellulare complex in a 44-year-old woman with malaise and a chronic cough. High-resolution CT scans of the right lung show multiple peripheral small nodules connected to branching linear opacities and a thick-walled cavity in the superior segment of the lower lobe. Note the thickening of the bronchial walls, bronchial dilatation, and mucus impaction. The diagnosis was confirmed with bronchoalveolar lavage.