Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Linear left basilar opacity may be due to atelectasis versus scarring . There is relative elevation of the left hemidiaphragm . The lungs are clear otherwise . There is no pneumothorax . The cardiomediastinal silhouette is within normal limits . Median sternotomy wires and mediastinal clips are identified . No acute osseous abnormalities .
    OUTPUT:
    
No definite acute cardiopulmonary process .