How should a pneumothorax be managed when it is small and stable versus large or symptomatic?

• A. Large or symptomatic: chest tube drainage; Small: observation with oxygen
• B. Small: chest tube; Large: observation
• C. Small: observation with oxygen; Large: chest tube drainage
• D. Small: oxygen; Large: no treatment

Answer: (C)

The main concept here is that pneumothorax management hinges on size and symptoms. A small, stable pneumothorax is unlikely to worsen quickly and can be watched while giving supplemental oxygen, which speeds the resorption of air from the pleural space and lets the lung re-expand without invasive intervention. In contrast, a large or symptomatic pneumothorax reduces lung function and can progress to respiratory compromise, so it requires active drainage to remove the air and re-expand the lung, with chest tube drainage being the standard approach. Supplemental oxygen helps the small pneumothorax resolve faster, while a sizeable or symptomatic one needs definitive drainage to prevent deterioration.