Air leak syndrome is the overarching diagnosis for one or more pathologic air collections present outside of the respiratory tract. Air leak occurs in approximately 10% of neonates with MAS for many presumed reasons including ball-valve effect of the meconium, ventilation-perfusion mismatch, surfactant inactivation, and parenchymal injury. In this study we planned to evaluate the prevalence of air leak syndrome in meconium aspiration syndrome.