<prompt> Commonest organ to be injured in primary blast injuries is -LungLiverSpleenSkin  <response>: The synopsis of forensic medicine toxicology ; Dr k.s narayan reddy ;28th edition ;pg.no. 138 . Lungs show sub pleural patchy hemorrhage in the ear ,often in the line of ribs ,rupture of alveolar septa bullae at the margins .Desquamated alveolar bronchial epithelium is seen lying free. This causes reactive pulmonary edema blood stained froth is found in air passages later bronchopneumonia .this is called blast lung . 