<prompt> Masson bodies are seen in:Usual interstitial pneumoniaNon-specific interstitial pneumoniaCryptogenic Organizing PneumoniaHyaline membrane disease  <response>: 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 . 