Pneumothorax

Pneumothorax occurs when air leaks into the space between the lungs and chest wall. The air pushes on the outside of the lung, the lung cannot expand normally, and it collapses. Usually, only a portion collapses.

Symptoms
Chest pain, dyspnea, cough, tachypnea, decreased lung sounds, hyper-resonant lungs (loud, clear percussion), tachycardia, cyanosis (patient has bluish tinge)