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Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
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Masson bodies are seen in:
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The correct answer is  Masson bodies is characterized by involvement of alveolar space. Alveolar space & bronchioles have collection of Fibroblast. It is seen in patient with Cryptogenic Organizing Pneumonia. Cryptogenic organizing pneumonia aka bronchiolitis obliterans organizing pneumonia. Usual interstitial pneumonia - associated with Idiopathic pulmonary fibrosis .