Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright and lateral views of the chest provided . Linear opacity in the left lower lung could represent atelectasis . No convincing signs of pneumonia or overt CHF . No large effusion or pneumothorax . The cardiomediastinal silhouette is normal . Imaged osseous structures are intact . No free air below the right hemidiaphragm is seen .
    OUTPUT:
    
Mild left basal atelectasis . No convincing signs of pneumonia or edema appearing