A 55-year-old man presents with dyspnea and an occasional cough. He is thin and has recently lost weight. Lung examination shows no adventitious sounds, and chest X-ray reveals hyperinflation with flattened diaphragms. Which diagnosis is most likely?

• A. Bronchogenic carcinoma
• B. Emphysema
• C. Tuberculosis
• D. Chronic bronchitis

Answer: (B)

The key idea here is air trapping from destruction of alveolar walls, which causes hyperinflation and flattening of the diaphragms on chest imaging. This pattern is classic for emphysema, a form of COPD. Emphysema leads to increased work of breathing and loss of elastic recoil, so patients often appear thin or cachectic and have dyspnea with a relatively quiet chest exam.

Why this fits better than the others: bronchogenic carcinoma could cause weight loss and dyspnea but usually shows a discrete mass on imaging rather than diffuse hyperinflation with flattened diaphragms. Tuberculosis typically presents with cough and systemic symptoms along with focal infiltrates or cavitations on imaging. Chronic bronchitis involves a productive cough and often prominent chest markings rather than the distinctive hyperinflation pattern. The combination of dyspnea, weight loss, and hyperinflated lungs with flattened diaphragms points most strongly to emphysema.