Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is top normal . The aorta remains tortuous . Mediastinal and hilar contours are unchanged . Pulmonary vasculature is not engorged . Patchy opacities in the lung bases may reflect atelectasis though infection or aspiration is not excluded in the correct clinical setting . No pleural effusion or pneumothorax is seen . There are mild degenerative changes noted in the thoracic spine .
    OUTPUT:
    
Patchy opacities in the lung bases may reflect atelectasis but infection or aspiration is not excluded in the correct clinical setting .