Which of the following statements about pneumothorax is true:

Answer is D (Often need chest tube inseion): Pneumothorax is associated with decreased breath sounds, hyperresonant (increased) percussion note. Chest tube drainage is often required but is not necessary in all cases. Many small pneumothoraces resolve spontaneously as air is reabsorbed from the pleural space. In reliable patients with small stable pneumothorax observation alone may be appropriate