Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Median sternotomy wires appear intact . There are numerous surgical clips in the anterior mediastinum likely from prior coronary artery bypass . The lungs are normally expanded and clear . The cardiomediastinal silhouette , hilar contours , and pleural surfaces are normal . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Clear lungs . No pneumonia or pleural effusion . Heart size normal .