HRCT scan of the chest showing an increased anteroposterior chest diameter, scattered air trapping, pleural thickening, and peripheral reticular opacities in the upper lobes. Note ectatic bronchi with unevenly thickened walls, centrilobular nodules, and bronchiolar filling with a tree-in-bud pattern, as well as opacities in the lower lobes, suggesting mucoid impaction and allergic bronchopulmonary aspergillosis with bronchiectasis.