Figure 23b. "Classic" severe BPD in a 3-month-old premature infant. (a) Frontal radiograph shows heterogeneous aeration, coarse strandlike areas of opacity, and intervening cystic lucencies. (b) Axial CT scan demonstrates right upper lobe regional air trapping anteriorly, architectural distortion with fibrotic subpleural parenchymal bands (arrows) and subsegmental atelectasis posteriorly, and diffuse coarse reticular opacities in the left lung.