Fenestrated endothelium and thickening of endothelium basement membrane in ALI/ARDS lung. Image (B) is a close up of (A). TEM images of ALI/ARDS lung, lung from mouse that died with acute lung injuy/acute respiratory distress syndrome after infection with P. berghei ANKA. E, endothelium; BM, basal membrane; niRBC, non-infected red blood cell. Fenestrated endothelium are indicated by arrow heads.