Lung biopsy from a patient with ARDS from sepsis. Note the pink proteinacious edema fluid filling the alveoli with classic deposition of hyaline membranes along the rims of the alveoli. There are also monocytes, macrophages, and neutrophils as well as probable denuded alveolar epithelial cells. These findings are consistent with the acute inflammatory and exudative phase of acute lung injury, pathologically termed diffuse alveolar damage. The section was stained with hematoxylin and eosin and the magnification is 200 x.