“…The association between pulmonary hyaline membranes and intra-alveolar edema in the newborn has been discussed by several authors [3,4,5,7,8,9,10,11,12]. It has been maintained that an increase in the capillary permeability in the pulmonary circulation, possibly secondary to hypoxia, leads to exudation of edematous fluid with a high protein content, which subsequently coagulates to form membranes [9,11,121. In a statistical analysis of the incidence of various pulmonary lesions in the newborn, however, no association has been found between the incidence of pulmonary hyaline membranes and intra-alveolar edema [5] but this is contrary to the findings of many other workers [4, 10, 111.…”