Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Moderate enlargement of cardiac silhouette is re - demonstrated . The mediastinal and hilar contours are unchanged with right hilar prominence again noted . Tracheostomy tube tip remains in unchanged position . There is mild upper zone vascular redistribution without overt pulmonary edema . Patchy left basilar opacity may reflect atelectasis but infection or aspiration is not excluded . A trace left pleural effusion may be present . No pneumothorax is identified . Clips in the right upper quadrant of the abdomen indicate prior cholecystectomy .
    OUTPUT:
    
Patchy opacity in the left lung base could reflect atelectasis but infection or aspiration is not excluded in the correct clinical setting . Probable trace left pleural effusion .