Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lung volumes are low which causes crowding of bronchovascular structures . Opacity in the , left greater than right , lung bases most likely represents atelectasis . No focal consolidation , pleural effusion or pneumothorax identified . The heart size is normal . The mediastinal contour is normal . Clips are noted in the right upper abdomen .
    OUTPUT:
    
Opacity in the , left greater than right , lung bases most likely represents atelectasis , however , in the appropriate setting could represent pneumonia .