It is a common biopsy finding. Through histology, diffuse alveolar damage goes through several stages:
1) Exudative phase - similar to pulmonary edema. The alveoli become flooded with transudate 2) Hyaline membrane production. Hyaline membranes are fibrous structures laid down in order to stop oxygen being absorbed via the damaged alveoli. 3) Organising phase
^Cotran, Ramzi S.; Kumar, Vinay; Fausto, Nelson; Nelso Fausto; Robbins, Stanley L.; Abbas, Abul K. (2005). Robbins and Cotran pathologic basis of disease. St. Louis, Mo: Elsevier Saunders. p. 715. ISBN0-7216-0187-1.