Fig. 4

A 35-year-old man with cystic fibrosis. a The AP radiograph shows moderate changes of cystic fibrosis. Large mucus plugs can be suspected in the perihilar regions bilaterally (arrowheads). b, c Two tomosynthesis sections show severely thickened bronchial walls, especially in the left upper quadrant (white arrows). Many of the bronchi are dilated and filled with large mucus plugs (arrowheads). A fluid level is seen in the left upper quadrant (black arrow)