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Figure 2b. M avium-intracellulare complex infection in 58-year-old woman. (a) Transverse thin-section (2.5-mm collimation) CT scan obtained at level of suprahepatic inferior vena cava shows varicose bronchiectasis with volume loss, multiple small nodules, and branching centrilobular nodules (ie, tree-in-bud pattern) (arrows) in the right middle lung lobe. Similar findings were seen in the lingular segment of the left upper lobe and both lower lobes. (b) Photomicrograph of lung specimen obtained at transbronchial lung biopsy shows infiltration of lymphocytes with mural granulomas (arrows) at the bronchiolar wall. A small granuloma (arrowhead) in the peribronchiolar interstitium also is shown. (Hematoxylin-eosin stain; original magnification, x40.)
