Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single frontal view of the chest . Lung volumes are low , exaggerating heart size . Left lung base ill - defined opacities are consistent with atelectasis or infection . No focal consolidation , pleural effusion , pneumothorax . Two metallic ___ overlie the right supraclavicular region and left upper chest .
    OUTPUT:
    
Left lung base opacities could represent atelectasis or infection .