Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is top normal in size . The hilar and mediastinal contours are normal . There is a linear opacity in the left mid lung , likely atelectasis . Otherwise , the lungs are well expanded and clear . There are no pleural effusions or pneumothorax . Visualized osseous structures are unremarkable .
    OUTPUT:
    
Atelectasis of left mid lung with no evidence of pleural effusions or pneumothorax .