Which type of pneumothorax occurs in young, tall men 20-40 who smoke without clinically significant apparent lung disease?

• A. Primary spontaneous pneumothorax
• B. Secondary pneumothorax
• C. Iatrogenic pneumothorax
• D. Tension pneumothorax

Answer: (A)

Primary spontaneous pneumothorax occurs in young, otherwise healthy individuals—especially tall, thin men who smoke—without clinically significant lung disease. It results from rupture of subpleural apical blebs, allowing air to enter the pleural space and collapse the lung. This scenario fits because there’s no underlying lung disease to explain a secondary pneumothorax. Iatrogenic pneumothorax happens after a medical procedure, and a tension pneumothorax is a dangerous complication characterized by pressure buildup and mediastinal shift, not a distinct etiologic category. Thus, the description aligns best with a primary spontaneous pneumothorax.