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Cryptogenic organizing pneumonia. (A) Peribronchial connective tissue and plugs of fibroblastic connective tissue. (B) Interstitial reactive chronic inflammatory infiltrate with buds of myxoid granulation tissue into alveolar airspaces (so-called Masson bodies) consistent with cryptogenic organizing pneumonia. Magnification: Trichrome stain ×40 (A), H&E ×125 (B).
