Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Moderate enlargement of the cardiac silhouette is re- demonstrated . Mediastinal and hilar contours are unchanged with atherosclerotic calcifications again noted at the aortic knob . Pulmonary vasculature is not engorged . Patchy opacities in the lung bases likely reflect areas of atelectasis , however infection can not be excluded in the correct clinical setting . No pleural effusion or pneumothorax is identified . No acute osseous abnormality is seen .
    OUTPUT:
    
Bibasilar patchy opacities , likely atelectasis . Infection can not be excluded in the correct clinical setting .