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Follicular bronchiolitis. (A,B) The high-resolution computed tomography shows centrilobular nodules and peribronchiolar opacities with a “tree-in-bud” distribution. (C,D) The lung biopsy reveals lymphocytic infiltrates in germinal centers distributed around the bronchioles and extending to the interlobular septa, avoiding the alveolar septa. Hematoxylin-eosin staining ×4 and ×2. Courtesy of Dr. A. Hernández Gallego.
