Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright portable view of the chest was obtained . Linear left base opacities most consistent with atelectasis . The right lung is clear . No large pleural effusion or pneumothorax . The cardiac and mediastinal silhouettes are unremarkable .
    OUTPUT:
    
Left base opacity most consistent with atelectasis which could be confirmed on PA and lateral views .