<s>[INST] My question is very similar to the preceding post which hasn t yet been answered. We have a newborn (yesterday), 7 lbs, 9oz, full term with air bubble in the pleural cavity (I think...the best I understood was between the lung and lung lining). Baby has been transported to ICU unit at nearest big city hospital. What are we facing? [/INST] Air in pleural space is pneumothorax. It could happen due to trauma to the chest wall or as a result of in appropriate ventilation/ infection. Newborn's lung compliance is less and hence minor injuries result in air inside pleura </s>