Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . Heart size is normal . Mediastinal and hilar contours are unremarkable . The pulmonary vasculature is not engorged . Patchy opacities in the lung bases may reflect atelectasis . No large pleural effusion or pneumothorax is identified . There are no acute osseous abnormalities .
    OUTPUT:
    
Patchy bibasilar opacities likely reflect atelectasis in the setting of low lung volumes .