What are common radiographic signs of pneumonia on a chest radiograph?

• A. Clear lungs with no consolidation
• B. Lobar or multilobar air-space consolidation with air bronchograms; possible effusion or atelectasis; thickened bronchovascular markings
• C. Isolated diaphragmatic elevation
• D. Isolated nodules only

Answer: (B)

Pneumonia on chest radiographs typically presents with air-space consolidation that can involve one lobe (lobar) or multiple lobes (multilobar). Within this dense white area, air-filled bronchi become visible as air bronchograms, giving a branching pattern inside the opacity. A pleural effusion or adjacent atelectasis can accompany the consolidation, especially with more extensive disease, and thickened bronchovascular markings reflect inflammatory changes in the small airways and interstitium. Other patterns—completely clear lungs, isolated diaphragmatic elevation, or isolated nodules—do not fit the typical infectious consolidation seen with pneumonia. Keep in mind that early infection can sometimes be radiographically subtle or normal despite clinical symptoms, so imaging is one piece of the diagnostic puzzle.