Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Linear left basilar opacities likely atelectasis versus scarring . The lungs are otherwise clear noting relatively low lung volumes . There is no overt pulmonary edema . The cardiomediastinal silhouette is accentuated by low lung volumes . Median sternotomy wires and mediastinal clips are noted .
    OUTPUT:
    
No acute cardiopulmonary process .