Figure 9b. Organizing phase of acute interstitial pneumonia in a 55-year-old man. (a) High-resolution CT scan demonstrates diffuse ground-glass attenuation, bronchiectasis, and bronchiolectasis (arrows). (b) High-resolution CT scan demonstrates diffuse ground-glass attenuation. A small amount of honeycomb lung affects the anterior part of the middle lobe (arrow). Small patches of consolidation affect the left lower lobe peripherally. (c) In the organizing phase, proliferative fibroblasts solidify the lung as they destroy alveolar architecture. Photomicrograph (original magnification, x50; hematoxylin-eosin stain) shows fibrin (a) filling a few residual alveoli (b). Pneumocytes are hyperplastic (c). d = alveolar septa.