Pneumothorax — Imaging

A 28-year-old previously healthy man presents with acute-onset right-sided chest pain and dyspnea. Chest X-ray confirms pneumothorax. What is the most common cause of spontaneous pneumothorax in this clinical scenario?

A 35-year-old male smoker with known COPD presents with acute dyspnea. Chest X-ray shows a small right-sided pneumothorax (< 2 cm at the hilum). The patient is clinically stable with oxygen saturation 94% on room air. Which investigation is most appropriate to assess the need for intervention and guide management?

A 35-year-old woman with known cystic fibrosis presents with acute dyspnea. Chest X-ray shows a 4 cm pneumothorax on the right side with no mediastinal shift. Vital signs are normal and oxygen saturation is 92% on room air. What is the most appropriate next step in management?

On a frontal chest radiograph, which radiological sign is most specific for detecting a small pneumothorax that may be missed on standard views?

During a review of chest X-rays in the radiology department, you are asked to identify the most common location of pneumothorax on frontal (PA/AP) radiographs. Where would you expect to see the visceral pleural line most frequently?