Can you interpret the chest radiograph findings in a patient with cough, which show a normal cardiac silhouette without chronic heart failure, well‑aerated lungs without consolidation or infiltrates, no acute hilar, mediastinal, or pleural abnormalities, and a mildly atherosclerotic, slightly tortuous thoracic aorta?

Chest X-Ray Interpretation: Normal Study in Patient with Cough

This chest radiograph shows no acute cardiopulmonary disease, which is reassuring but does not exclude important causes of chronic cough—particularly bronchiectasis and bronchial wall thickening, which are missed by chest X-ray in up to 34% of cases. 1

What This Normal X-Ray Tells You

The radiograph demonstrates:

• No pneumonia, tuberculosis, or lung cancer – the clear lung fields and absence of consolidation effectively rule out these acute processes
• No heart failure – normal cardiac silhouette and absence of pulmonary edema or pleural effusions exclude cardiac causes
• Atherosclerotic aorta – this is an age-related finding without clinical significance for the cough

Critical Limitation: What the X-Ray Cannot See

Chest radiography has poor sensitivity (64-71%) for the most common causes of chronic cough found on CT imaging. 1 The normal X-ray does NOT exclude:

• Bronchiectasis (present in 28% of chronic cough patients with normal X-rays) 1
• Bronchial wall thickening (present in 21% of cases) 1
• Early interstitial lung disease
• Small airway abnormalities

Next Steps Based on Cough Duration

If Acute Cough (<3 weeks):

• Empiric treatment for common causes (post-viral, upper respiratory infection)
• No further imaging needed at this time

If Chronic Cough (>8 weeks):

Follow this algorithmic approach: 1, 2

1. Perform spirometry immediately – identifies asthma and COPD, which together with reflux and rhinitis account for 61-67% of chronic cough 1, 2

2. Empirically treat the most common causes first:

   • Gastroesophageal reflux disease
   • Cough-variant asthma (even with normal spirometry)
   • Upper airway cough syndrome (post-nasal drip)

3. Reserve CT chest for specific scenarios: 1

   • Failure of empiric treatment after 8 weeks
   • Clinical suspicion of bronchiectasis (productive cough, recurrent infections)
   • Concern for interstitial lung disease (dyspnea, crackles on exam)
   • Red flags: hemoptysis, weight loss, smoking history, systemic symptoms

Common Pitfall to Avoid

Do not assume a normal chest X-ray excludes all pulmonary pathology in chronic cough. Major pulmonary societies recommend proceeding to non-contrast chest CT only after common causes are excluded or empirically treated, not as initial imaging. 1 Indiscriminate CT use in all chronic cough patients has low clinical yield—in one study, CT was noncontributory in 48 of 49 patients with respiratory complaints. 1

The key is clinical context: If the patient has isolated cough without alarm features and normal spirometry, treat empirically for 8 weeks before considering CT. If there are concerning features (hemoptysis, weight loss, recurrent pneumonias, abnormal spirometry), proceed directly to CT imaging. 1