Which imaging study is typically obtained first to evaluate suspected pneumonia and confirm the diagnosis?

• A. CT scan of chest with contrast
• B. Echocardiography
• C. Chest X-ray
• D. MRI of chest

Answer: (C)

When pneumonia is suspected, the first imaging step is a chest X-ray. It’s quick, widely available, and usually sufficient to confirm the diagnosis by showing focal air-space consolidation, which is typical of pneumonia, and to assess for complications like pleural effusion or abscess. This test also helps distinguish pneumonia from other causes of cough and fever and provides a baseline to track progress.

A CT scan of the chest offers more detail, but it isn’t used first-line because it involves more radiation, higher cost, and is typically reserved for unclear cases, suspicion of complications, or atypical presentations. Echocardiography looks at heart structure and function, not lung infection, so it’s not appropriate for confirming pneumonia. MRI is not routinely used for pneumonia due to practicality, cost, and longer exam times. If clinical suspicion remains high despite a normal chest X-ray, clinicians may repeat imaging or use CT for further evaluation.