On chest radiography, which finding is most typical of pneumonia?

On chest radiography, which finding is most typical of pneumonia?

• A. Consolidation of lung tissue
• B. Hyperinflation
• C. Pleural effusion only
• D. Normal chest

Answer: (B)

Pneumonia on chest radiographs is most often seen as consolidation of lung tissue. This means the alveoli fill with inflammatory exudate, pus, or fluid, making that portion of the lung appear denser and less aerated. The opacity is typically focal or lobar and may obscure the underlying vessels; air-filled bronchi can stand out as air bronchograms in dense consolidation. This pattern reflects alveolar filling, which is the hallmark of pneumonia across many etiologies.

Hyperinflation, on the other hand, suggests air trapping and is more typical of obstructive processes such as bronchiolitis, asthma, or viral infections with airway hyperreactivity, not the classic image of pneumonia. Pleural effusion can occur with pneumonia but is not the defining feature, and a normal chest would not show pneumonia.