Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Shallow inspiration . Linear perihilar , bibasilar opacities , largely appearance of atelectasis . More prominent opacity left lower lobe medially behind the heart , atelectasis versus pneumonitis . Findings are new since prior exam . Tiny right pleural effusion or thickening . No pneumothorax .
    OUTPUT:
    
Shallow inspiration . Basilar opacities , largely atelectasis . More prominent opacity left lower lobe , atelectasis versus pneumonitis . Tiny right pleural effusion .