Fig. 3. Photomicrographs showing (A) intra-alveolar Masson bodies indicating an organizing pneumonia pattern (hematoxylin and eosin, ×200), (B) Masson bodies (Masson's trichrome stain, ×200), (C) a few alveoli with fibrin balls (hematoxylin and eosin, ×200), and (D) an interstitial eosinophilic infiltrate (hematoxylin and eosin, ×400).