what condition is the collapse of a lung
Very rarely both lungs may be affected by a pneumothorax. It is often called a collapsed lung, although that term may also refer to atelectasis. A primary pneumothorax is one that occurs without an apparent cause and in the absence of significant lung disease, while a secondary pneumothorax occurs in the presence of existing lung disease. Smoking increases the risk as do lung diseases including COPD, asthma, and tuberculosis.