Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lung volumes are low . The cardiac , mediastinal and hilar contours appear unchanged . Patchy medial left basilar opacification has improved somewhat . Streaky bibasilar opacities more generally suggest minor atelectasis . There is no pleural effusion or pneumothorax . Bony structures are unremarkable .
    OUTPUT:
    
Improving left lower lobe opacity .