A 64-year-old patient with heavy smoking history presents with worsening dyspnea and cough; which chest x-ray finding is most consistent with emphysema?

• A. Pulmonary vascular congestion
• B. Left lower lobe infiltrate
• C. Apical infiltrates
• D. Hyperinflation with bullae

Answer: (D)

Emphysema results from destruction of alveolar walls and loss of elastic recoil, which promotes air trapping and increased lung volumes. On a chest X-ray this shows up as hyperinflated lungs with flattened diaphragms and often bullae from coalesced air spaces, typically more in the upper lobes. These features reflect the lungs staying expanded at the end of exhalation, not fluid overload or infection. In contrast, signs like pulmonary vascular congestion point to edema from heart failure, and infiltrates suggest infection or edema. So hyperinflation with bullae best fits emphysema.