1. Air leak syndrome Pulmonary interstitial emphysema. Pneumothorax. Pneumomediastinum. Pneumopericadium. Pneumoperitonium. Subcutaneous emphysema.

2. Air leak syndrome Definition:- Alveolar rupture with escape of air out of the alveoli. Interstitioum first stage. pleural rupture. ( mediastinum, pericardium , abdominal cavity, under the skin) 3. Risk factor Diseases procedures ventilation RDS Meconium aspiration syndrome . Amniotic fluid aspiration Infection . Prematurity