Figure 8c. Exudative phase of acute interstitial pneumonia in a 31-year-old woman. (a, b) High-resolution CT scans demonstrate diffuse ground-glass attenuation and minor interlobular septal thickening (arrows). (c) Photomicrograph (original magnification, x50; hematoxylin-eosin stain) shows hyaline membranes (a) lining the alveolar ducts. b = acute interstitial inflammation.