Figure 6a. Late-phase cryptogenic organizing pneumonia in an 81-year-old woman. (a) High-resolution CT scan of the upper lobes shows peripheral consolidation (arrow). (b) High-resolution CT scan obtained at the level of the bronchus intermedius demonstrates bilateral peribronchovascular ground-glass attenuation (arrows) and left-sided subpleural consolidation. (c) Photomicrograph (original magnification, x50; hematoxylin-eosin stain) shows a branching tuft of myxoid fibrous tissue (black lines) filling an alveolar duct. a = alveoli, b = interstitial fibrosis.