Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: External artifact projects over the left upper hemithorax . There are low lung volumes and bibasilar atelectasis . Posterior basilar opacity seen on the lateral view may relate to atelectasis however consolidation due to pneumonia is not excluded . No pleural effusion or pneumothorax is seen . The cardiac and mediastinal silhouettes are unremarkable .
    OUTPUT:
    
Low lung volumes and bibasilar atelectasis . Posterior basilar opacity seen on the lateral view may relate to atelectasis , however consolidation due to pneumonia is not excluded .